Quotes about theory

A collection of quotes on the topic of theory, use, other, doing.

Luis A. Ferré quote: “My theory was that a city without a newspaper is a city without a soul.”

Quotes about theory

“In youth, it was a way I had,
To do my best to please.
And change, with every passing lad
To suit his theories.

But now I know the things I know
And do the things I do,
And if you do not like me so,
To hell, my love, with you.”

Dorothy Parker (1893–1967) American poet, short story writer, critic and satirist

Source: The Complete Poems of Dorothy Parker

Love, Youth, Way, Hell

“Humankind does not submit passively to the power of nature. It takes control over this power. This process is not an internal or subjective one. It takes place objectively in practice, once women cease to be viewed as mere sexual beings, once we look beyond their biological functions and become conscious of their weight as an active social force. What's more, woman's consciousness of herself is not only a product of her sexuality. It reflects her position as determined by the economic structure of society, which in turn expresses the level reached by humankind in technological development and the relations between classes.

The importance of dialectical materialism lies in going beyond the inherent limits of biology, rejecting simplistic theories about our being slaves to the nature of our species, and, instead, placing facts in their social and economic context.”

Thomas Sankara (1949–1987) President of Upper Volta

Source: Women's Liberation and the African Freedom Struggle

Women, Nature

“In theory, it matters little to me whether I live as whether I die; in practice, I am lacerated by every anxiety which opens an abyss between life and death.”

Emil M. Cioran (1911–1995) Romanian philosopher and essayist

The New Gods (1969)

Life, Death

“My main professional interest during the 1970s has been in the dramatic change of concepts and ideas that has occurred in physics during the first three decades of the century, and that is still being elaborated in our current theories of matter. The new concepts in physics have brought about a profound change in our world view; from the mechanistic conception of Descartes and Newton to a holistic and ecological view, a view which I have found to be similar to the views of mystics of all ages and traditions.”

Fritjof Capra book The Turning Point

Preface.
The Turning Point (1982)

Age, World, Idea, Change

“Music is so important to us. We hear music from the moment we are born, often via lullabies, and through many of the most important occasions in our lives, from graduations to weddings to funerals. There is something about music that seems to bring us closer to each other and help us come together as a community.
Humans are wired for music. Researchers recently discovered that we have a dedicated part of our brain for processing music, supporting the theory that it has a special, important function in our lives.
Listening to music and singing together has been shown in several studies to directly impact neuro-chemicals in the brain, many of which play a role in closeness and connection. Now new research suggests that playing music or singing together may be particularly potent in bringing about social closeness through the release of endorphins.
Through singing, drumming, and dancing—all resulted in participants having higher pain thresholds (a proxy measure for increased endorphin release in the brain) in comparison to listening to music alone. In addition, the performance of music resulted in greater positive emotion, suggesting one pathway through which people feel closer to one another when playing music together is through endorphin release.”

Stephie Pahlavi Zan

Pain, People, Music, Feeling

“If a theory of justice is to guide reasoned choice of policies, strategies or institutions, then the identification of fully just social arrangements is neither necessary nor sufficient.”

Amartya Sen book The Idea of Justice

Source: The Idea of Justice

Justice

“You must forget all your theories, all your ideas before the subject. What part of these is really your own will be expressed in your expression of the emotion awakened in you by the subject.”

Henri Matisse (1869–1954) French artist

Idea, Parting, Forgetting

“There are all kinds of sources of our knowledge; but none has authority … The fundamental mistake made by the philosophical theory of the ultimate sources of our knowledge is that it does not distinguish clearly enough between questions of origin and questions of validity.”

Karl Popper (1902–1994) Austrian-British philosopher of science

Conjectures and Refutations: The Growth of Scientific Knowledge (1963)

Question, Knowledge

“Experience without theory is blind, but theory without experience is mere intellectual play.”

Immanuel Kant (1724–1804) German philosopher

This is declared to be "an old Kantian maxim" in General Systems Vol. 7-8 (1962)‎, p. 11, by the Society for the Advancement of General Systems Theory, but may simply be a paraphrase or summation of Kantian ideas.
Kant's treatment of the transcendental logic in the First Critique contains a portion, of which this quote may be an ambiguously worded paraphrase. Kant, claiming that both reason and the senses are essential to the formation of our understanding of the world, writes: "Without sensibility no object would be given to us, and without understanding none would be thought. Thoughts without content are empty, intuitions without concepts are blind (A51/B75)".
Disputed

“It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

"On the Method of Theoretical Physics" The Herbert Spencer Lecture, delivered at Oxford (10 June 1933); also published in Philosophy of Science, Vol. 1, No. 2 (April 1934), pp. 163-169., p. 165. [thanks to Dr. Techie @ www.wordorigins.org and JSTOR] There is a quote attributed to Einstein that may have arisen as a paraphrase of the above quote, commonly given as “Everything should be made as simple as possible, but no simpler,” "Everything should be made as simple as possible, but not simpler", or “Make things as simple as possible, but not simpler.” See this article from the Quote Investigator http://quoteinvestigator.com/2011/05/13/einstein-simple/ for a discussion of where these later variants may have arisen. The original quote is very similar to Occam's razor, which advocates that among all hypotheses compatible with all available observations, the simplest hypothesis is the most plausible one. The aphorism "everything should be made as simple as possible, but no simpler" is normally taken to be a warning against too much simplicity and emphasizes that one cannot simplify things to a point where the hypothesis is no more compatible with all observations. The aphorism does not contradict or extend Occam's razor, but rather stresses that both elements of the razor, simplicity and compatibility with the observations, are essential. The earliest known appearance of Einstein's razor is an essay by Roger Sessions in the New York Times (8 January 1950) http://select.nytimes.com/gst/abstract.html?res=F30615FE3559137A93CAA9178AD85F448585F9, where Sessions appears to be paraphrasing Einstein: “I also remember a remark of Albert Einstein, which certainly applies to music. He said, in effect, that everything should be as simple as it can be, but not simpler.” Another early appearance, from Time magazine (14 December 1962) http://www.time.com/time/magazine/article/0,9171,872923,00.html: “We try to keep in mind a saying attributed to Einstein—that everything must be made as simple as possible, but not one bit simpler.” 1930s

“Be reverent before the dawning day. Do not think of what will be in a year, or in ten years. Think of to-day. Leave your theories. All theories, you see, even those of virtue, are bad, foolish, mischievous. Do not abuse life. Live in to-day. Be reverent towards each day. Love it, respect it, do not sully it, do not hinder it from coming to flower. Love it even when it is gray and sad like to-day. Do not be anxious. See. It is winter now. Everything is asleep. The good earth will awake again. You have only to be good and patient like the earth. Be reverent. Wait. If you are good, all will go well. If you are not, if you are weak, if you do not succeed, well, you must be happy in that. No doubt it is the best you can do. So, then, why will? Why be angry because of what you cannot do? We all have to do what we can.... Als ich kann.”

Romain Rolland (1866–1944) French author

Gottfried to Jean-Christophe. Part 3: Ada
Jean-Christophe (1904 - 1912), Youth (1904)

Waiting, Making love, Bad luck, Flowers

Stephie Pahlavi Zan

Pain, People, Music, Feeling

“Many adults feel that every children's book has to teach them something…. My theory is a children's book… can be just for fun.”

R.L. Stine (1943) American writer and producer

Children, Books, Feeling

“Without Revolutionary theory, there can be no Revolutionary Movement.”

Vladimir Lenin (1870–1924) Russian politician, led the October Revolution

“We will be asked how, on our theory, justice can be a virtue and injustice a vice, since it will surely be difficult to show that any man whatsoever must need to be just as he needs the use of his hands and eyes, or needs prudence, courage and temperance? Before answering this question I shall argue that if it cannot be answered then justice can no longer be recommended as a virtue.”

Philippa Foot (1920–2010) British philosopher

"Moral Beliefs"

Justice, Courage, Question

“…racial hatred is not a natural phenomenon innate in man. It is the product of ideologies. But even if such a thing as a natural and inborn hatred between various races existed, it would not render social cooperation futile and would not invalidate Ricardo's theory of association. Social cooperation has nothing to do with personal love or with a general commandment to love one another. People do not cooperate under the division of labor because they love or should love one another. They cooperate because this best serves their own interests. Neither love nor charity nor any other sympathetic sentiments but rightly understood selfishness is what originally impelled man to adjust himself to the requirements of society, to respect the rights and freedoms of his fellow men and to substitute peaceful collaboration for enmity and conflict.”

Ludwig von Mises book Human Action

Part 2, VIII.84
Human Action (1949)

Love, Men, People, Peace

“Mathematicians have constructed a very large number of different systems of geometry, Euclidean or non-Euclidean, of one, two, three, or any number of dimensions. All these systems are of complete and equal validity. They embody the results of mathematicians' observations of their reality, a reality far more intense and far more rigid than the dubious and elusive reality of physics. The old-fashioned geometry of Euclid, the entertaining seven-point geometry of Veblen, the space-times of Minkowski and Einstein, are all absolutely and equally real. …There may be three dimensions in this room and five next door. As a professional mathematician, I have no idea; I can only ask some competent physicist to instruct me in the facts.
The function of a mathematician, then, is simply to observe the facts about his own intricate system of reality, that astonishingly beautiful complex of logical relations which forms the subject-matter of his science, as if he were an explorer looking at a distant range of mountains, and to record the results of his observations in a series of maps, each of which is a branch of pure mathematics. …Among them there perhaps none quite so fascinating, with quite the astonishing contrasts of sharp outline and shade, as that which constitutes the theory of numbers.”

G. H. Hardy (1877–1947) British mathematician

"The Theory of Numbers," Nature (Sep 16, 1922) Vol. 110 https://books.google.com/books?id=1bMzAQAAMAAJ p. 381

Beauty, Mountain, Mathematics, Idea

“Is it because Westerners have come to lose their intellectuality through over-developing their capacity for action that they console themselves by inventing theories which set action above everything, and even go so far, as in the case of pragmatism, as to deny that there exists anything of value beyond action; or is the contrary true, that it is the acceptance of this point of view that has led to the intellectual atrophy we see today?”

René Guénon (1886–1951) French metaphysician

Source: The Crisis of the Modern World (1927), p. 47

“Economists have uncovered the conditions necessary if Adam Smith’s results are to be achieved and where, in the real world, such conditions do not appear to be found, they have proposed changes which are designed to bring them about. It is what one finds in the textbooks. Harold Demsetz has said rightly that what this theory analyses is a system of extreme decentralisation. It has been a great intellectual achievement and it throws light on many aspects of the economic system. But it has not been by any means all gain.”

Ronald H. Coase (1910–2013) British economist and author

1990s and later, "The Institutional Structure of Production" (1992)

World, Light, Appearance, Change

“Experience arises together with theoretical assumptions not before them, and an experience without theory is just as incomprehensible as is (allegedly) a theory without experience.”

Paul Karl Feyerabend book Against Method

pg 151.
Against Method (1975)

“The idea that an advanced civilization need not rest on slavery is a relatively new idea, for instance; it is a good deal younger than the Christian religion. But even if Chesterton's dictum were true, it would only be true in the sense that a statue is contained in every block of stone. Ideas may not change, but emphasis shifts constantly. It could be claimed, for example, that the most important part of Marx's theory is contained in the saying: ‘Where your treasure is, there will your heart be also.’ But before Marx developed it, what force had that saying had? Who had paid any attention to it? Who had inferred from it — what it certainly implies — that laws, religions and moral codes are all a superstructure built over existing property relations? It was Christ, according to the Gospel, who uttered the text, but it was Marx who brought it to life. And ever since he did so the motives of politicians, priests, judges, moralists and millionaires have been under the deepest suspicion — which, of course, is why they hate him so much.”

George Orwell (1903–1950) English author and journalist

As I Please (25 February 1944) http://orwell.ru/library/articles/As_I_Please/english/eaip_01 "As I Please" (1943–1947)

Life, Hate, Religion, Law

“It is called a “pure” theory of law, because it only describes the law and attempts to eliminate from the object of this description everything that is not strictly law: Its aim is to free the science of law from alien elements. This is the methodological basis of the theory.”

Hans Kelsen book Pure Theory of Law

Pure Theory of Law (revised ed., 1960), 1. The “Pure” Theory

Law, Science

“Bourgeois scientists make sure that their theories are not dangerous to God or Capital.”

Georgi Plekhanov (1856–1918) Russian revolutionary

The Faber Book of Aphorisms, W. H. Auden and Louis Kronenberger (ed.), p. 261.
Attributed

God

“[Hitler] has grasped the falsity of the hedonistic attitude to life. Nearly all western thought since the last war, certainly all "progressive" thought, has assumed tacitly that human beings desire nothing beyond ease, security, and avoidance of pain. In such a view of life there is no room, for instance, for patriotism and the military virtues. The Socialist who finds his children playing with soldiers is usually upset, but he is never able to think of a substitute for the tin soldiers; tin pacifists somehow won’t do. Hitler, because in his own joyless mind he feels it with exceptional strength, knows that human beings don’t only want comfort, safety, short working-hours, hygiene, birth-control and, in general, common sense; they also, at least intermittently, want struggle and self-sacrifice, not to mention drums, flags and loyalty-parades. However they may be as economic theories, Fascism and Nazism are psychologically far sounder than any hedonistic conception of life. The same is probably true of Stalin’s militarised version of Socialism. All three of the great dictators have enhanced their power by imposing intolerable burdens on their peoples. Whereas Socialism, and even capitalism in a grudging way, have said to people "I offer you a good time," Hitler has said to them "I offer you struggle, danger and death," and as a result a whole nation flings itself at his feet.”

George Orwell (1903–1950) English author and journalist

From a review of Adolf Hitler's Mein Kampf, New English Weekly (21 March 1940)

Life, Death, Pain, War

“If a person doesn’t think there is a God to be accountable to, then—then what's the point of trying to modify your behaviour to keep it within acceptable ranges? That's how I thought anyway. I always believed the theory of evolution as truth, that we all just came from the slime. When we, when we died, you know, that was it, there is nothing …”

Jeffrey Dahmer (1960–1994) American serial killer, cannibal and necrophile

In an interview with Stone Phillips, Dateline NBC (29 November 1994)

God, Truth, Thinking, Personality

“This mental activity, at first involuntary under the pressure of illness and suffering, gradually became second nature and led me finally to recognize that I was but an automaton devoid of free will in thought and action and merely responsible to the forces of the environment. Our bodies are of such complexity of structure, the motions we perform are so numerous and involved and the external impressions on our sense organs to such a degree delicate and elusive, that it is hard for the average person to grasp this fact. Yet nothing is more convincing to the trained investigator than the mechanistic theory of life which had been, in a measure, understood and propounded by Descartes three hundred years ago.”

Nikola Tesla (1856–1943) Serbian American inventor

My Inventions (1919)

Life, Nature, Sense, Suffering

“No theory, no ready-made system, no book that has ever been written will save the world. I cleave to no system. I am a true seeker.”

Mikhail Bakunin (1814–1876) Russian revolutionary, philosopher, and theorist of collectivist anarchism

As quoted in Michael Bakunin (1937) by E.H. Carr, p. 175

Books, World

“The striving for significance, this sense of yearning, always points out to us that all psychological phenomena contain a movement that starts from a feeling of inferiority and reach upward. The theory of Individual Psychology of psychological compensation states that the stronger the feeling of inferiority, the higher the goal for personal power.”

Alfred Adler (1870–1937) Medical Doctor, Psychologist, Psychiatrist, Psychotherapist, Personality Theorist

From a new translation of "Progress in Individual Psychology" ("Fortschritte der Individualpsychologie", 1923), a journal article by Alfred Adler, in the AAISF/ATP Archives.

Feeling, Sense, Personality

“We want a fireworks theory of evolution. The last two thousand million years are slow evolution: they are the smoke and ashes of bright but very rapid fireworks.”

Georges Lemaître (1894–1966) Belgian scientist and priest

Article in Nature, 1931, vol 128, page 704

“Einstein's relativity work is a magnificent mathematical garb which fascinates, dazzles and makes people blind to the underlying errors. The theory is like a beggar clothed in purple whom ignorant people take for a king… its exponents are brilliant men but they are metaphysicists rather than scientists.”

Nikola Tesla (1856–1943) Serbian American inventor

New York Times (11 July 1935), p. 23, c.8

Men, People, Error, Mathematics

“Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory.”

Stephen Hawking book A Brief History of Time

Source: A Brief History of Time (1988), Ch. 1
Context: Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory. On the other hand, you can disprove a theory by finding even a single observation that disagrees with the predictions of the theory. As philosopher of science Karl Popper has emphasized, a good theory is characterized by the fact that it makes a number of predictions that could in principle be disproved or falsified by observation. Each time new experiments are observed to agree with the predictions the theory survives, and our confidence in it is increased; but if ever a new observation is found to disagree, we have to abandon or modify the theory.

Sense, Time

“The modern proletarian class doesn't carry out its struggle according to a plan set out in some book or theory; the modern workers' struggle is a part of history, a part of social progress, and in the middle of history, in the middle of progress, in the middle of the fight, we learn how we must fight…”

Rosa Luxemburg (1871–1919) Polish Marxist theorist, socialist philosopher, and revolutionary

"The Politics of Mass Strikes and Unions"; Collected Works 2 
Context: The modern proletarian class doesn't carry out its struggle according to a plan set out in some book or theory; the modern workers' struggle is a part of history, a part of social progress, and in the middle of history, in the middle of progress, in the middle of the fight, we learn how we must fight... That's exactly what is laudable about it, that's exactly why this colossal piece of culture, within the modern workers' movement, is epoch-defining: that the great masses of the working people first forge from their own consciousness, from their own belief, and even from their own understanding the weapons of their own liberation.

Books, History, Learning, Fight

“It is the only physical theory of universal content concerning which I am convinced that, within the framework of the applicability of its basic concepts, it will never be overthrown”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

1940s, "Autobiographical Notes" (1949)
Context: A theory is the more impressive the greater the simplicity of its premises is, the more different kinds of things it relates, and the more extended is its area of applicability. Therefore the deep impression which classical thermodynamics made upon me. It is the only physical theory of universal content concerning which I am convinced that, within the framework of the applicability of its basic concepts, it will never be overthrown (for the special attention of those who are skeptics on principle).

Universe

“The accepted theory that the serpent is evil cannot be substantiated. It has long been viewed as the emblem of immortality. It is the symbol of reincarnation, or metempsychosis, because it annually sheds its skin…It was also believed that snakes swallowed themselves, and this resulted in their being considered emblematic of the Supreme Creator, who periodically reabsorbed His universe back into Himself.”

Manly P. Hall (1901–1990) Canadian writer and mystic

Source: The Secret Teachings of All Ages (1928), Chapter: Fishes, Insects, Animals, Reptiles and Birds

Universe, Evil

“The theory of chance consists in reducing all the events of the same kind to a certain number of cases equally possible”

Pierre-Simon Laplace book Philosophical Essay on Probabilities

Philosophical Essay on Probabilities (1902)
Context: The theory of chance consists in reducing all the events of the same kind to a certain number of cases equally possible, that is to say, to such as we may be equally undecided about in regard to their existence, and in determining the number of cases favorable to the event whose probability is sought.<!--p.6

Chance

“In a Society in which there is no law, and in theory no compulsion, the only arbiter of behaviour is public opinion. But public opinion, because of the tremendous urge to conformity in gregarious animals, is less tolerant than any system of law.”

George Orwell (1903–1950) English author and journalist

"Politics vs. Literature: An Examination of Gulliver's Travels," Polemic (September/October 1946) - Full text online http://orwell.ru/library/reviews/swift/english/e_swift Context: In a Society in which there is no law, and in theory no compulsion, the only arbiter of behaviour is public opinion. But public opinion, because of the tremendous urge to conformity in gregarious animals, is less tolerant than any system of law. When human beings are governed by "thou shalt not", the individual can practise a certain amount of eccentricity: when they are supposedly governed by "love" or "reason", he is under continuous pressure to make him behave and think in exactly the same way as everyone else.

Law, Animals

“If we are uncritical we shall always find what we want: we shall look for, and find, confirmations, and we shall look away from, and not see, whatever might be dangerous to our pet theories.”

Karl Popper book The Poverty of Historicism

The Poverty of Historicism (1957) Ch. 29 The Unity of Method
Context: If we are uncritical we shall always find what we want: we shall look for, and find, confirmations, and we shall look away from, and not see, whatever might be dangerous to our pet theories. In this way it is only too easy to obtain what appears to be overwhelming evidence in favor of a theory which, if approached critically, would have been refuted.

“If one harbours anywhere in one's mind a nationalistic loyalty or hatred, certain facts, although in a sense known to be true, are inadmissible. Here are just a few examples. I list below five types of nationalist, and against each I append a fact which it is impossible for that type of nationalist to accept, even in his secret thoughts:
: BRITISH TORY. Britain will come out of this war with reduced power and prestige.
: COMMUNIST. If she had not been aided by Britain and America, Russia would have been defeated by Germany.
: IRISH NATIONALIST. Eire can only remain independent because of British protection.
: TROTSKYIST. The Stalin regime is accepted by the Russian masses.
: PACIFIST. Those who "abjure" violence can only do so because others are committing violence on their behalf.
All of these facts are grossly obvious if one's emotions do not happen to be involved: but to the kind of person named in each case they are also intolerable, and so they have to be denied, and false theories constructed upon their denial. I come back to the astonishing failure of military prediction in the present war. It is, I think, true to say that the intelligentsia have been more wrong about the progress of the war than the common people, and that they were more swayed by partisan feelings. The average intellectual of the Left believed, for instance, that the war was lost in 1940, that the Germans were bound to overrun Egypt in 1942, that the Japanese would never be driven out of the lands they had conquered, and that the Anglo-American bombing offensive was making no impression on Germany. He could believe these things because his hatred for the British ruling class forbade him to admit that British plans could succeed. There is no limit to the follies that can be swallowed if one is under the influence of feelings of this kind. I have heard it confidently stated, for instance, that the American troops had been brought to Europe not to fight the Germans but to crush an English revolution. One has to belong to the intelligentsia to believe things like that: no ordinary man could be such a fool.”

George Orwell (1903–1950) English author and journalist

Notes on Nationalism (1945)

War, People, Secret, Fools

“Any theory based on experience is necessarily statistical; that is to say, it formulates an ideal average which abolishes all exceptions at either end of the scale and replaces them by an abstract mean.”

C.G. Jung (1875–1961) Swiss psychiatrist and psychotherapist who founded analytical psychology

p 6
The Undiscovered Self (1958)
Context: Any theory based on experience is necessarily statistical; that is to say, it formulates an ideal average which abolishes all exceptions at either end of the scale and replaces them by an abstract mean. This mean is quite valid though it need not necessarily occur in reality. Despite this it figures in the theory as an unassailable fundamental fact. … If, for instance, I determine the weight of each stone in a bed of pebbles and get an average weight of 145 grams, this tells me very little about the real nature of the pebbles. Anyone who thought, on the basis of these findings, that he could pick up a pebbles of 145 grams at the first try would be in for a serious disappointment. Indeed, it might well happen that however long he searched he would not find a single pebble weighing exactly 145 grams. The statistical method shows the facts in the light of the ideal average but does not give us a picture of their empirical reality. While reflecting an indisputable aspect of reality, it can falsify the actual truth in a most misleading way.

“On theory: "I don’t know any theory. Knowing the theory does not mean anything.”

Vangelis (1943) Greek composer of electronic, progressive, ambient, jazz, pop rock, and orchestral music

If we theoretically know what a human being is, but someone has never seen one, or if you have never had a relationship with a human being, you cannot know anything about human beings! I think that the best way to gain knowledge is through gaining experience and through connections... Look, if I approach an instrument theoretically, it will give me a theory, so therefore this will make cold music".
1979

“Conspiracy theories (actually: hypotheses) are comforting, anthropocentric, affirming constructs. They assume that someone runs the world, that someone is in control. The sad truth is that nobody is in control. That's way more terrifying.”

Johannes Grenzfurthner (1975) Austrian artist, writer, curator, and theatre and film director

via Twitter https://twitter.com/johannes_mono/status/1250039288517050369

World, Truth, Sadness, Way

“One of the most significant management functions is control. Controls are usually directed by organization policies and procedures. They are based on the concept that people should have a thorough understanding of management expectations. And there should be consequences for noncompliance. Penalties for noncompliance are predicated upon the theory, that people will not behave if they have nothing to lose.”

Gandolfo – (RJ Intindola)

1978

Penalty, People, Understanding

“The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first and love of soft living and the get-rich-quick theory of life.”

Theodore Roosevelt (1858–1919) American politician, 26th president of the United States

Letter to S. Stanwood Menken, chairman, committee on Congress of Constructive Patriotism (January 10, 1917). Roosevelt’s sister, Mrs. Douglas Robinson, read the letter to a national meeting, January 26, 1917. Reported in Proceedings of the Congress of Constructive Patriotism, Washington, D.C., January 25–27, 1917 (1917), p. 172
1910s
Context: Americanism means the virtues of courage, honor, justice, truth, sincerity, and hardihood—the virtues that made America. The things that will destroy America are prosperity-at-any-price, peace-at-any-price, safety-first instead of duty-first, the love of soft living and the get-rich-quick theory of life.

Love, Life, Peace

“I have a theory that the truth is never told during the nine-to-five hours.”

Hunter S. Thompson (1937–2005) American journalist and author

2000s, Kingdom of Fear: Loathsome Secrets of a Star-crossed Child in the Final Days of the American Century (2004)

Truth

“They believed that prediction was just a function of keeping track of things. If you knew enough, you could predict anything. That's been cherished scientific belief since Newton.'
And?'
Chaos theory throws it right out the window.”

Michael Crichton book Jurassic Park

Source: Jurassic Park

“How empty is theory in the presence of fact!”

Mark Twain book A Connecticut Yankee in King Arthur's Court

Source: A Connecticut Yankee in King Arthur's Court

“It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.”

Arthur Conan Doyle Sherlock Holmes

Source: Sherlock Holmes

“In theory it was, around now, Literature. Susan hated Literature. She'd much prefer to read a good book.”

Terry Pratchett book Soul Music

Source: Soul Music

Hate, Books, Literature, Reading

“We do not talk - we bludgeon one another with facts and theories gleaned from cursory readings of newspapers, magazines and digests.”

Henry Miller (1891–1980) American novelist

1945 Source: [Kaufman, Charlie, Inspirational Writing Advice From Charlie Kaufman - On Writing, https://www.youtube.com/watch?v=eRfXcWT_oFs, YouTube, BAFTA Guru, 2017-01-06, 2020-03-09] (at 7:08 of 41:08)

Reading

“Read no history: nothing but biography, for that is life without theory.”

Benjamin Disraeli (1804–1881) British Conservative politician, writer, aristocrat and Prime Minister

Part 1, Chapter 23.
Books, Coningsby (1844), Contarini Fleming (1832)

Life, History, Reading

“The "trickle-down" theory: the principle that the poor, who must subsist on table scraps dropped by the rich, can best be served by giving the rich bigger meals.”

William Blum (1933–2018) American author and historian

“I see evil when I look in my shaving mirror. It is, philosophically, present everywhere in the universe in order, apparently, to highlight the existence of good. I think there is more to this theory, but I tend to burst out laughing at this point.”

Terry Pratchett book Unseen Academicals

Source: Unseen Academicals

Thinking, Universe, Evil

“Am going to cross Pacific on a wooden raft to support a theory that the South Sea islands were peopled from Peru. Will you come? I guarantee nothing but a free trip to Peru and the South Sea islands and back, but you will find good use for your technical abilities on the voyage. Reply at once.'

Next day the following telegram arrived from Torstein:

COMING. TORSTEIN.”

Thor Heyerdahl (1914–2002) Norwegian anthropologist and adventurer

People, Support, Sea

“The studying, the books, exams, arguments, theories. The jokes and pints, laughter, kisses and songs. Life was like running, ninety percent sweat and toil, ten per cent joy.”

Siobhan Dowd book Bog Child

Source: Bog Child

Life, Books, Kiss, Laughter

“Only someone who (like the Intuitionist) denies that the concepts and axioms of classical set theory have any meaning could be satisfied with such a solution, not someone who believes them to describe some well-determined reality. For in reality Cantor's conjecture must be either true or false, and its undecidability from the axioms as known today can only mean that these axioms do not contain a complete description of reality.”

Kurt Gödel (1906–1978) logician, mathematician, and philosopher of mathematics

Reality, Falseness

“Whole new theories of money were growing here like mushrooms: in the dark and based on bullshit.”

Terry Pratchett book Making Money

Source: Making Money

Money

“You've never heard of Chaos theory? Non-linear equations? Strange attractors? Ms. Sattler, I refuse to believe you're not familiar with the concept of attraction.”

Michael Crichton book Jurassic Park

Source: Jurassic Park

“My theory is that all of Scottish cuisine is based on a dare.”

Mike Myers (1963) Canadian- British- American actor, comedian, singer, screenwriter, and film producer

Funny

“The supreme misfortune is when theory outstrips performance”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

“Every development of truths which relate to human nature, and more especially its active manifestations, is attended with a wish to see worked out in practice what theory has shown us to be just and good. To man, whose mind is seldom satisfied with the calmly beneficent influence of abstract ideas, this desire is perfectly natural, and it increases in liveliness with the spirit of benevolent sympathy in social happiness and well-being. But, however natural in itself, and however noble in its origin, this desire has not unfrequently led to hurtful consequences,—nay, often to greater evils than the colder indifference, or (as from the very opposite cause the same effect may follow) the glowing enthusiasm, which, comparatively heedless of reality, delights only in the pure beauty of ideas.”

Wilhelm Von Humboldt (1767–1835) German (Prussian) philosopher, government functionary, diplomat, and founder of the University of Berlin

Source: The Limits of State Action (1792), Ch. 16

Truth, Beauty, Idea, Nature

“The treatises of Darboux (1842–1917) and Bianchi (1856–1928) on surface theory are among the great works in the mathematical literature. They are: G. Darboux, Théorie générale des surfaces, Tome 1 (1887), 2 (1888), 3 (1894), 4 (1896), and later editions and reprints. L. Bianchi. Lezioni di Geometria Differenziale, Pisa 1894; German translation by Lukat, Lehrbuch der Differentialgeometrie, 1899. The subject is basically local surface theory.”

Shiing-Shen Chern (1911–2004) mathematician (1911–2004), born in China and later acquiring U.S. citizenship; made fundamental contributio…

[1991, Surface Theory with Darboux and Bianchi, Miscellanea Mathematica, 59–69, Springer, https://doi.org/10.1007/978-3-642-76709-8_4]

Literature, Mathematics

“The historic terrain of macro-economic theory is the explanation of the levels and fluctuations of overall economic activity. Macro-economists have been especially interested in the effects of alternative fiscal, financial, and monetary policies.”

James Tobin (1918–2002) American economist

Source: "Money and Finance in the Macro-Economic Process" (1982), p. 12

“We shall have [a complete theory] only when the laws of Physics shall be extended enough, generalized enough, to make known beforehand all the effects of heat acting in a determined manner on any body.”

Nicolas Léonard Sadi Carnot (1796–1832) French physicist, the "father of thermodynamics" (1796–1832)

p, 125
Reflections on the Motive Power of Heat (1824)

Law

“My theory is that for those of us who are too weak to remain single, God gives us a spouse. For those of us who are too hung up to handle marriage, God gives us celibacy. So, pick your weakness. Pick your poison, I guess. But anyway, for those of you who do choose to be in love and stuff, go for it.”

Rich Mullins (1955–1997) American christian musician

Anderson, Indiana http://www.kidbrothers.net/words/concert-transcripts/anderson-indiana-nov1695.html (November 16, 1995) In Concert

Love, God, Marriage

“Our admiration for natural beauty /…/ cares not to understand either the physical theories which explain what it admires, or the psychological theories which explain its admiration. It does not deny the truth of the first, nor (within due limits) the sufficiency of the second. But it requires more. It feels itself belittled unless conscious purpose can be found somewhere in its pedigree. Physics and psycho-physics, by themselves, suffice not. It longs to regard beauty as a revelation—a revelation from spirit to spirit, not from one kind of atomic agitation to the "psychic" accompaniment of another. On this condition only can its highest values be maintained.'”

Arthur James Balfour (1848–1930) British Conservative politician and statesman

Theism and humanism

Truth, Beauty, Feeling, Understanding

“If there is a single assumption which pervades conventional organizational theory, it is that authority is the central, indispensable means of managerial control.”

Douglas McGregor (1906–1964) American professor

Source: The Human Side of Enterprise (1960), p. 18 (2006; 24)

“If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found the object of his search. … I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.”

Nikola Tesla (1856–1943) Serbian American inventor

New York Times (19 October 1931)

Search, Bee

“Einstein is the only figure in the physical sciences with a stature that can be compared with Newton. Newton is reported to have said "If I have seen further than other men, it is because I stood on the shoulders of giants." This remark is even more true of Einstein who stood on the shoulders of Newton. Both Newton and Einstein put forward a theory of mechanics and a theory of gravity but Einstein was able to base General Relativity on the mathematical theory of curved spaces that had been constructed by Riemann while Newton had to develop his own mathematical machinery. It is therefore appropriate to acclaim Newton as the greatest figure in mathematical physics and the Principia is his greatest achievement.”

Stephen Hawking (1942–2018) British theoretical physicist, cosmologist, and author

"Newton's Principia" in 300 Years of Gravitation. (1987) by S. W. Hawking and W. Israel, p. 4

Men, Mathematics, Science

“Scientific theories need reconstruction every now and then. If they didn't need reconstruction they would be facts, not theories.”

Charles Proteus Steinmetz (1865–1923) Mathematician and electrical engineer

New York Times interview (1911)

“As I was reading the extract from your paper in the geometric sum and difference… I was struck by the marvelous similarity between your results and those discoveries which I made even as early as 1832…
I conceived the first idea of the geometric sum and difference of two or more lines and also of the geometric product of two or three lines in that year (1832). This idea is in all ways identical to that presented in your paper. But since I was for a long time occupied with entirely different pursuits, I could not develop this idea. It was only in 1839 that I was led back to that idea and pursued this geometrical analysis up to the point where it ought to be applicable to all mechanics. It was possible for me to apply this method of analysis to the theory of tides, and in this I was astounded by the simplicity of the calculations resulting from this method.”

Hermann Grassmann (1809–1877) German polymath, linguist and mathematician

Letter to Saint-Venant (1845) as quoted by Michael J. Crowe, A History of Vector Analysis: The Evolution of the Idea of a Vectorial System (1967)

Way, Idea, Time, Reading

“I have this theory about why men kill each other and break things. … Never mind. It's a dumb theory. I was going to say it was all sexual … but everything is sexual … but alcohol.”

Kurt Vonnegut Happy Birthday, Wanda June

"Mildred"
Happy Birthday, Wanda June (1970)

Men, Alcohol

“So we find that the three possible solutions of the great problem of increasing human energy are answered by the three words: food, peace, work. Many a year I have thought and pondered, lost myself in speculations and theories, considering man as a mass moved by a force, viewing his inexplicable movement in the light of a mechanical one, and applying the simple principles of mechanics to the analysis of the same until I arrived at these solutions, only to realize that they were taught to me in my early childhood. These three words sound the key-notes of the Christian religion. Their scientific meaning and purpose now clear to me: food to increase the mass, peace to diminish the retarding force, and work to increase the force accelerating human movement. These are the only three solutions which are possible of that great problem, and all of them have one object, one end, namely, to increase human energy. When we recognize this, we cannot help wondering how profoundly wise and scientific and how immensely practical the Christian religion is, and in what a marked contrast it stands in this respect to other religions. It is unmistakably the result of practical experiment and scientific observation which have extended through the ages, while other religions seem to be the outcome of merely abstract reasoning. Work, untiring effort, useful and accumulative, with periods of rest and recuperation aiming at higher efficiency, is its chief and ever-recurring command. Thus we are inspired both by Christianity and Science to do our utmost toward increasing the performance of mankind. This most important of human problems I shall now specifically consider.”

Nikola Tesla (1856–1943) Serbian American inventor

The Problem of Increasing Human Energy (1900)

Age, Peace, Religion, Food

“There are good people who, being discontented with present-day conditions, think that these conditions can be cured by a return to what they call the “principles of the fathers.” […] But to go back to the governmental theories of a hundred years ago would accomplish nothing whatever; for it was under the conditions of unrestricted individualism and freedom from Government interference, countenanced by those theories, that the trusts grew up, and private fortunes, enormous far beyond the deserts of the accumulators were gathered. […] It may be that, in the past development of our country, complete freedom from all restrictions, and the consequent unlimited encouragement and reward given to the most successful industrial leaders, played a part in which the beneﬁts outweighed the disadvantages. But nowadays such is not the case.”

Theodore Roosevelt (1858–1919) American politician, 26th president of the United States

1910s, The Progressives, Past and Present (1910)

People, Thinking, Freedom, Success

“Like body and soul theory and practice are one, and like body and soul they are for the most part at loggerheads.”

Marie von Ebner-Eschenbach (1830–1916) Austrian writer

Theorie und Praxis sind Eins wie Seele und Leib, und wie Seele und Leib liegen sie großenteils mit einander in Streit.
Source: Aphorisms (1880/1893), p. 59.

Soul, Parting

“First of all I want to remind you of the essential features of models. In my opinion they are: (i) drawing up a list of the variables to be considered; (ii) drawing up a list of the equations or relations the variables have to obey and (iii) testing the validity of the equations, which implies the estimation of their coefficients, if any. As a consequence of especially (iii) we may have to revise (i) and (ii) so as to arrive at a satisfactory degree of realism of the theory embodied in the model. Then, the model may be used for various purposes, that is, for the solution of various problems. The advantages of models are, on one hand, that they force us to present a "complete" theory by which I mean a theory taking into account all relevant phenomena and relations and, on the other hand, the confrontation with observation, that is, reality. Of course these remarks are far from new.”

Jan Tinbergen (1903–1994) Dutch economist

"The Use of Models: Experience," 1969

Problem, Reality, Drawing

“The owl of wisdom flies, as is well known, after sunset. Thus the theory of a "socialist" system of money and prices was developed only after twilight of inflationist illusions.”

Leon Trotsky book The Revolution Betrayed

Source: The Revolution Betrayed (1936), Ch. 4, Section 3 : The Rehabilitation of the Ruble

Wisdom, Money

“When you look at a vacuum in a quantum theory of fields, it isn't exactly nothing.”

Peter Higgs (1929) British physicist

in video Meet Peter Higgs http://cdsweb.cern.ch/record/1019670 by CERN (July 2004).

“The legislator should keep two things constantly before his eyes:
1. The pure theory developed to its minutest details;
2. The particular condition of actual things which he designs to reform.”

Wilhelm Von Humboldt (1767–1835) German (Prussian) philosopher, government functionary, diplomat, and founder of the University of Berlin

Source: The Limits of State Action (1792), Ch. 16

“To say that Nature displays intelligence doesn't make you a Christian fundamentalist. Einstein said as much, and a fascinating theory called the anthropic principle has been seriously considered by Stephen Hawking, among others.”

Deepak Chopra (1946) Indian-American physician, public speaker and writer

"Intelligent Design Without the Bible" in The Huffington Post (23 August 2005)

Intelligence, Nature

“[Messrs Ogden and Richards] will reply that they are considering the meaning of a "thought," not of a word. A "thought" is not a social phenomenon, like speech, and therefore does not have the two sides, active and passive, which can be distinguished in speech. I should urge, however, that all the reasons which led our authors to avoid introducing images in explaining meaning should have also led them to avoid introducing "thoughts." If a theory of meaning is to be fitted into natural science as they desire, it is necessary to define the meaning of words without introducing anything "mental" in the sense in which what is "mental" is not subject to the laws of physics. Therefore, for the same reasons for which I now hold that the meaning of words should be explained without introducing images – which I argued to be possible in the above-quoted passage – I also hold that meaning in general should be treated without introducing "thoughts," and should be regarded as a property of words considered as physical phenomena. Let us therefore amend their theory. They say: "'I am thinking of A' is the same thing as 'My thought is being caused by A.'" Let us substitute: "'I am speaking of A' is the same thing as 'My speech is being caused by A.'" Can this theory be true?”

Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist

1920s, Review of The Meaning of Meaning (1926)

Law, Quotes, Nature, Thinking

“(…) Theories are neither right nor wrong. They are attempts at explaining the inexplicable. It is not the theory that matters, but the way it is being tested. (…) Experiment with any theory you like – if you are truly earnest and honest, the attainment of reality will be yours. (…) It is the earnestness that liberates and not the theory.”

Nisargadatta Maharaj (1897–1981) Indian guru

Liberation
Source: I am That, P.118-9.

Way, Reality

“What can a man say about woman, his own opposite? I mean of course something sensible, that is outside the sexual program, free of resentment, illusion, and theory. Where is the man to be found capable of such superiority? Woman always stands just where the man's shadow falls, so that he is only too liable to confuse the two. Then, when he tries to repair this misunderstanding, he overvalues her and believes her the most desirable thing in the world.”

C.G. Jung (1875–1961) Swiss psychiatrist and psychotherapist who founded analytical psychology

Source: "Woman in Europe" (1927), P. 236

World

“[T]he successes of modern control theory in the design of highly accurate space navigation systems have stimulated its use in the theoretical analyses of economic and biological systems. Similarly, the effectiveness of computer simulation techniques in the macroscopic analyses of physical systems has brought into vogue the use of computer-based econometric models for purposes of forecasting, economic planning, arid management.”

Lotfi A. Zadeh (1921–2017) Electrical engineer and computer scientist

Source: 1970s, Outline of a new approach to the analysis of complex systems and decision processes (1973), p. 28

Success

“My objections to Marx are of two sorts: one, that he was muddle-headed; and the other, that his thinking was almost entirely inspired by hatred. The doctrine of surplus value, which is supposed to demonstrate the exploitation of wage-earners under capitalism, is arrived at: (a) by surreptitiously accepting Malthus's doctrine of population, which Marx and all his disciples explicitly repudiate; (b) by applying Ricardo's theory of value to wages, but not to the prices of manufactured articles. He is entirely satisfied with the result, not because it is in accordance with the facts or because it is logically coherent, but because it is calculated to rouse fury in wage-earners. Marx's doctrine that all historical events have been motivated by class conflicts is a rash and untrue extension to world history of certain features prominent in England and France a hundred years ago. His belief that there is a cosmic force called Dialectical Materialism which governs human history independently of human volitions, is mere mythology. His theoretical errors, however, would not have mattered so much but for the fact that, like Tertullian and Carlyle, his chief desire was to see his enemies punished, and he cared little what happened to his friends in the process.”

Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist

Source: 1950s, Portraits from Memory and Other Essays (1956), p. 211

World, Error, History, Motivation

“Students using astrophysical textbooks remain essentially ignorant of even the existence of plasma concepts, despite the fact that some of them have been known for half a century. The conclusion is that astrophysics is too important to be left in the hands of astrophysicists who have gotten their main knowledge from these textbooks. Earthbound and space telescope data must be treated by scientists who are familiar with laboratory and magnetospheric physics and circuit theory, and of course with modern plasma theory.”

Hannes Alfvén (1908–1995) Swedish electrical engineer and plasma physicist

Source: Dean of the Plasma Dissidents (1988), p. 197.

Knowledge

“It is the principle of necessity towards which, as to their ultimate centre, all the ideas advanced in this essay immediately converge. In abstract theory the limits of this necessity are determined solely by considerations of man’s proper nature as a human being; but in the application we have to regard, in addition, the individuality of man as he actually exists. This principle of necessity should, I think, prescribe the grand fundamental rule to which every effort to act on human beings and their manifold relations should be invariably conformed. For it is the only thing which conducts to certain and unquestionable results. The consideration of the useful, which might be opposed to it, does not admit of any true and unswerving decision.”

Wilhelm Von Humboldt (1767–1835) German (Prussian) philosopher, government functionary, diplomat, and founder of the University of Berlin

The Limits of State Action (1792)

Idea, Nature, Thinking, Decision

“With regard to countries with a belated bourgeois development, especially the colonial and semi-colonial countries, the theory of the permanent revolution signifies that the complete and genuine solution of their tasks of achieving democracy and national emancipation is conceivable only through the dictatorship of the proletariat as the leader of the subjugated nation, above all of its peasant masses.”

Leon Trotsky book The Permanent Revolution

Source: The Permanent Revolution (1929), Ch. 10

Democracy, Country

“In fact, there is something puzzling about the Higgs mass we now do observe. It is generally known as the “hierarchy problem.” Since it is the Higgs mass that sets the scale for the masses of all other known elementary particles, one might guess that it should be similar to another mass that plays a fundamental role in physics, the so-called Planck mass, which is the fundamental unit of mass in the theory of gravitation. (It is the mass of hypothetical particles whose gravitational attraction for one another would be as strong as the electric force between two electrons separated by the same distance.) But the Planck mass is about a hundred thousand trillion times larger than the Higgs mass. So, although the Higgs particle is so heavy that a giant particle collider was needed to create it, we still have to ask, why is the Higgs mass so small?”

Steven Weinberg (1933) American theoretical physicist

"The Big Higgs Question" http://www.nybooks.com/daily/2012/07/09/big-higgs-question/, The New York Review of Books, 9 July 2012

Problem, Strong, Time

“In science we must all submit not to what seems to us attractive from one point of view or another, but to what represents an agreement between theory and experiment.”

Dmitri Mendeleev (1834–1907) Russian chemist and inventor

Faraday Lecture, the Royal Institution, London (1889) as quoted by Leon Gray, The Basics of the Periodic Table (2013)

Science

“American institutionalists were not theoretical but anti-theoretical…. Without a theory they had nothing to pass on except a mass of descriptive material waiting for a theory, or a fire.”

Ronald H. Coase (1910–2013) British economist and author

Ronald H. Coase (1984). "The New Institutional Economics." Journal of Institutional and Theoretical Economics 140 (March): 299-231; p. 230; As cited in: Malcolm Rutherford (1996), Institutions in Economics: The Old and the New Institutionalism. p. 9
1960s-1980s

Waiting

“Notwithstanding the eminent difficulties of the mathematical theory of sonorous vibrations, we owe to it such progress as has yet been made in acoustics. The formation of the differential equations proper to the phenomena is, independent of their integration, a very important acquisition, on account of the approximations which mathematical analysis allows between questions, otherwise heterogeneous, which lead to similar equations. This fundamental property, whose value we have so often to recognize, applies remarkably in the present case; and especially since the creation of mathematical thermology, whose principal equations are strongly analogous to those of vibratory motion. This means of investigation is all the more valuable on account of the difficulties in the way of direct inquiry into the phenomena of sound. We may decide the necessity of the atmospheric medium for the transmission of sonorous vibrations; and we may conceive of the possibility of determining by experiment the duration of the propagation, in the air, and then through other media; but the general laws of the vibrations of sonorous bodies escape immediate observation. We should know almost nothing of the whole case if the mathematical theory did not come in to connect the different phenomena of sound, enabling us to substitute for direct observation an equivalent examination of more favorable cases subjected to the same law. For instance, when the analysis of the problem of vibrating chords has shown us that, other things being equal, the number of oscillations is hi inverse proportion to the length of the chord, we see that the most rapid vibrations of a very short chord may be counted, since the law enables us to direct our attention to very slow vibrations. The same substitution is at our command in many cases in which it is less direct.”

Auguste Comte (1798–1857) French philosopher

Bk. 3, chap. 4; as cited in: Moritz (1914, 240)
System of positive polity (1852)

Law, Way, Mathematics, Question

“In chess so much depends on opening theory, so the champions before the last century did not know as much as I do and other players do about opening theory. So if you just brought them back from the dead they wouldn’t do well. They’d get bad openings. You cannot compare the playing strength, you can only talk about natural ability. Memorization is enormously powerful. Some kid of fourteen today, or even younger, could get an opening advantage against Capablanca, and especially against the players of the previous century, like Morphy and Steinitz. Maybe they would still be able to outplay the young kid of today. Or maybe not, because nowadays when you get the opening advantage not only do you get the opening advantage, you know how to play, they have so many examples of what to do from this position. It is really deadly, and that is why I don’t like chess any more.”

Bobby Fischer (1943–2008) American chess prodigy, chess player, and chess writer

Radio Interview, October 16 2006 http://www.geocities.jp/bobbby_b/mp3/F_35_3.MP3 2000s

Nature, Dependency, Dead

“Remembering… that Eratosthenes of Cyrene, employing mathematical theories and geometrical methods, discovered from the course of the sun, the shadows cast by an equinoctial gnomon, and the inclination of the heaven that the circumference of the earth is two hundred and fifty-two thousand stadia, that is, thirty-one million five hundred thousand paces.”

Vitruvius book De architectura

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter VI, Sec. 9

Mathematics, Sun

“Thought and theory must precede all salutary action; yet action is nobler in itself than either thought or theory.”

Virginia Woolf (1882–1941) English writer

Sometimes ascribed to Virginia Woolf, but it appeared as early as 1854 in Anna Jameson's A Commonplace Book of Thoughts, Memories and Fancies, where it is ascribed to William Wordsworth.
Misattributed