Quotes about theory
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Karl Marx photo
Karl Marx photo
Eckhart Tolle photo
Albert Einstein photo

“Since the mathematicians have invaded the theory of relativity, I do not understand it myself anymore.”

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

As quoted in the essay "To Albert Einstein's Seventieth Birthday" by Arnold Sommerfeld, Albert Einstein : Philosopher-Scientist http://www.worldcat.org/title/albert-einstein-philosopher-scientist/oclc/311439 (1949) edited by Paul A. Schilpp (p. 102). The essay, originally published as "Zum Siebzigsten Geburtstag Albert Einsteins" in Deutsche Beiträge (Eine Zweimonatsschrift) http://www.worldcat.org/title/deutsche-beitrage-eine-zweimonatsschrift/oclc/183334232 Vol. III, No 2, 1949, was translated specifically for the book by Schilpp.
1940s
Variant: Since others have explained my theory, I can no longer understand it myself.

Marya Hornbacher photo
Richard Dawkins photo
Charles Darwin photo

“If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down. But I can find out no such case.”

Source: On the Origin of Species (1859), Chapter VI: "Difficulties on Theory", page 189 http://darwin-online.org.uk/content/frameset?pageseq=207&itemID=F373&viewtype=image
Source: The Origin of Species

Bill Hicks photo

“What's gotten in the way of education in the United States is a theory of social engineering that says there is ONE RIGHT WAY to proceed with growing up.”

John Taylor Gatto (1935–2018) American teacher, book author

Source: Dumbing Us Down: The Hidden Curriculum of Compulsory Schooling (1992), p. 68

Eoin Colfer photo
Laurie Halse Anderson photo
Jenny Offill photo
Steven Wright photo
Agatha Christie photo
Louis Althusser photo

“Philosophy is, in the last instance, class struggle in the field of theory.”

Louis Althusser (1918–1990) French political philosopher

Source: Essays in Self-Criticism

Paul Beatty photo
Werner Heisenberg photo

“Quantum theory provides us with a striking illustration of the fact that we can fully understand a connection though we can only speak of it in images and parables.”

Die Quantentheorie ist so ein wunderbares Beispiel dafür, daß man einen Sachverhalt in völliger Klarheit verstanden haben kann und gleichzeitig doch weiß, daß man nur in Bildern und Gleichnissen von ihm reden kann.
Der Teil und das Ganze. Gespräche im Umkreis der Atomphysik (1969); also in "Kein Chaos, aus dem nicht wieder Ordnung würde", Die Zeit No. 34 (22 August 1969) http://www.zeit.de/1969/34/kein-chaos-aus-dem-nicht-wieder-ordnung-wuerde/komplettansicht; as translated in Physics and Beyond : Encounters and Conversation (1971)

Harlan Coben photo
Yogi Berra photo

“In theory there is no difference between theory and practice; in practice there is.”

Yogi Berra (1925–2015) American baseball player, manager, coach

Attributed in Nassim Nicholas Taleb, Antifragile - Things that Gain From Disorder (2012), p. 213.
The earliest known appearance of this quote in print is Walter J. Savitch, Pascal: An Introduction to the Art and Science of Programming (1984), where it is attributed as a "remark overheard at a computer science conference". It circulated as an anonymous saying for more than ten years before attributions to Jan L. A. van de Snepscheut and Yogi Berra began to appear (and later still to various others).
Disputed, Misattributed

Michio Kaku photo
Isaac Asimov photo

“[Creationists] make it sound as though a "theory" is something you dreamt up after being drunk all night.”

Isaac Asimov (1920–1992) American writer and professor of biochemistry at Boston University, known for his works of science fiction …

Often attributed as remarks to the National Coalition Against Censorship (NCAC) (1980)
General sources

Jean Baudrillard photo

“The secret of theory is that truth does not exist.”

Jean Baudrillard (1929–2007) French sociologist and philosopher

Source: Fragments: Cool Memories III, 1990-1995

Cassandra Clare photo

“In theory, when yoou're done with training, you should be able ot kick a hole in a wall or eknock out a moose with a single punch."

"I would never hit a moose," said Clary. "They're endangered.”

Variant: And second, keep in mind that you are a weapon. In theory, when you're done with training, you should be able to kick a hole in a wall or knock out a moose with a single punch."
"I would never hit a moose," said Clary. "They're endangered.
Source: City of Fallen Angels

Will Rogers photo
Bret Easton Ellis photo
Cecelia Ahern photo
Alexis De Tocqueville photo
William James photo

“As a rule we disbelieve all the facts and theories for which we have no use.”

William James (1842–1910) American philosopher, psychologist, and pragmatist

"The Will to Believe" p. 10 http://books.google.com/books?id=Moqh7ktHaJEC&pg=PA10
1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)

Eoin Colfer photo
Haruki Murakami photo
Philip K. Dick photo
James Baldwin photo

“I don't like people who like me because I'm a Negro; neither do I like people who find in the same accident grounds for contempt. I love America more than any other country in the world, and, exactly for this reason, I insist on the right to criticize her perpetually. I think all theories are suspect, that the finest principles may have to be modified, or may even be pulverized by the demands of life, and that one must find, therefore, one's own moral center and move through the world hoping that this center will guide one aright.”

James Baldwin (1924–1987) (1924-1987) writer from the United States

Autobiographical Notes (1952)
Context: I don't like people who like me because I'm a Negro; neither do I like people who find in the same accident grounds for contempt. I love America more than any other country in the world, and, exactly for this reason, I insist on the right to criticize her perpetually. I think all theories are suspect, that the finest principles may have to be modified, or may even be pulverized by the demands of life, and that one must find, therefore, one's own moral center and move through the world hoping that this center will guide one aright. I consider that I have many responsibilities, but none greater than this: to last, as Hemingway says, and get my work done.
I want to be an honest man and a good writer.

Alan Moore photo
Winston S. Churchill photo

“I pass with relief from the tossing sea of Cause and Theory to the firm ground of Result and Fact.”

Early career years (1898–1929)
Source: The Story of the Malakand Field Force: An Episode of Frontier War (1898), Chapter III.

“My theory on housework is, if the item doesn't multiply, smell, catch fire, or block the refrigerator door, let it be. No one else cares. Why should you?”

Erma Bombeck (1927–1996) When I stand before God at the end of my life, I would hope that I would not have a single bit of talent le…
Jonathan Safran Foer photo
Etgar Keret photo
Eoin Colfer photo

“The Theory of Evolution has more holes in it than a dam made out of Swiss cheese.”

Eoin Colfer (1965) Irish author of children's books

Source: The Time Paradox

Helen Fielding photo
Daniel Handler photo

“Everybody has a theory.”

Source: Adverbs

Douglas Coupland photo

“Here's my theory about meetings and life: the three things you can't fake are erections, competence and creativity.”

Source: JPod (2006)
Context: Here’s my theory about meetings and life: the three things you can’t fake are erections, competence and creativity. That’s why meetings become toxic — they put uncreative people in a situation in which they have to be something they can never be. And the more effort they put into concealing their inabilities, the more toxic the meeting becomes.

Albert Einstein photo

“If my theory of relativity is proven successful, Germany will claim me as a German and France will declare me a citizen of the world. Should my theory prove untrue, France will say that I am a German, and Germany will declare that I am a Jew.”

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

1910s
Variant: If my theory of relativity is proven successful, Germany will claim me as a German and France will declare that I am a citizen of the world. Should my theory prove untrue, France will say that I am a German and Germany will declare that I am a Jew. (Address to the French Philosophical Society at the Sorbonne (6 April 1922); French press clipping (7 April 1922) [Einstein Archive 36-378] and Berliner Tageblatt (8 April 1922) [Einstein Archive 79-535])
Variant translation: If my theory of relativity is proven correct, Germany will claim me as a German and France will say I am a man of the world. If it's proven wrong, France will say I am a German and Germany will say I am a Jew.
Variant: If relativity is proved right the Germans will call me a German, the Swiss will call me a Swiss citizen, and the French will call me a great scientist. If relativity is proved wrong the French will call me a Swiss, the Swiss will call me a German and the Germans will call me a Jew.
Context: By an application of the theory of relativity to the taste of readers, today in Germany I am called a German man of science, and in England I am represented as a Swiss Jew. If I come to be represented as a bête noire, the descriptions will be reversed, and I shall become a Swiss Jew for the Germans and a German man of science for the English!

H.L. Mencken photo

“If we assume that man actually does resemble God, then we are forced into the impossible theory that God is a coward, an idiot and a bounder.”

H.L. Mencken (1880–1956) American journalist and writer

Variant: If we assume that man actually does resemble God, then we are forced into the impossible theory that God is a coward, an idiot and a bounder.

Aldous Huxley photo

“It is man's intelligence that makes him so often behave more stupidly than the beasts. … Man is impelled to invent theories to account for what happens in the world. Unfortunately, he is not quite intelligent enough, in most cases, to find correct explanations.”

Aldous Huxley (1894–1963) English writer

Texts and Pretexts (1932), p. 270
Context: It is man's intelligence that makes him so often behave more stupidly than the beasts. … Man is impelled to invent theories to account for what happens in the world. Unfortunately, he is not quite intelligent enough, in most cases, to find correct explanations. So that when he acts on his theories, he behaves very often like a lunatic. Thus, no animal is clever enough, when there is a drought, to imagine that the rain is being withheld by evil spirits, or as punishment for its transgressions. Therefore you never see animals going through the absurd and often horrible fooleries of magic and religion. No horse, for example would kill one of its foals to make the wind change direction. Dogs do not ritually urinate in the hope of persuading heaven to do the same and send down rain. Asses do not bray a liturgy to cloudless skies. Nor do cats attempt, by abstinence from cat's meat, to wheedle the feline spirits into benevolence. Only man behaves with such gratuitous folly. It is the price he has to pay for being intelligent but not, as yet, intelligent enough.

Nassim Nicholas Taleb photo

“I will repeat the following until I am hoarse: it is contagion that determines the fate of a theory in social science, not its validity.”

Nassim Nicholas Taleb (1960) Lebanese-American essayist, scholar, statistician, former trader and risk analyst

Source: The Black Swan: The Impact of the Highly Improbable

Jeanette Winterson photo
John Wilmot photo
Cecelia Ahern photo
Steven Wright photo
Albert Einstein photo
Gloria Steinem photo
H.L. Mencken photo

“We must respect the other fellow's religion, but only in the sense and to the extent that we respect his theory that his wife is beautiful and his children smart.”

H.L. Mencken (1880–1956) American journalist and writer

1
1940s–present, Minority Report : H.L. Mencken's Notebooks (1956)
Source: Minority Report

William James photo

“First, you know, a new theory is attacked as absurd; then it is admitted to be true, but obvious and insignificant; finally it is seen to be so important that its adversaries claim that they themselves discovered it.”

William James (1842–1910) American philosopher, psychologist, and pragmatist

Lecture VI, Pragmatism's Conception of Truth
1900s, Pragmatism: A New Name for Some Old Ways of Thinking (1907)

Bret Easton Ellis photo
Alfred De Vigny photo
Cassandra Clare photo
Sarah Dessen photo
Tom Robbins photo
Erich Fromm photo
Joy Harjo photo

“I've always had a theory that some of us are born with nerve endings longer than our bodies”

Joy Harjo (1951) American writer

Source: In Mad Love and War

F. Scott Fitzgerald photo
Thomas Sowell photo
James Joyce photo

“Let us leave theories there and return to here's hear.”

Source: Finnegans Wake

H.L. Mencken photo

“Democracy is the theory that the common people know what they want, and deserve to get it good and hard.”

H.L. Mencken (1880–1956) American journalist and writer

"A Few Pages of Notes," http://books.google.com/books?id=hXVHAAAAYAAJ&q=%22Democracy+is+the+theory+that+the+common+people+know+what+they+want+and+deserve+to+get+it+good+and+hard%22&pg=PA435#v=onepage The Smart Set (January 1915); later published in A Little Book in C major http://books.google.com/books?id=EAJbAAAAMAAJ&q=%22Democracy+is+the+theory+that+the+common+people+know+what+they+want+and+deserve+to+get+it+good+and+hard%22&pg=PA19#v=onepage (1916), and A Mencken Crestomathy (1949)
1910s
Source: A Little Book in C Major

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Jeremy Rifkin photo
Chinmayananda Saraswati photo
George Steiner photo
Samuel Butler photo
Edith Hamilton photo

“Theories that go counter to the facts of human nature are foredoomed.”

Edith Hamilton (1867–1963) American teacher and writer

Source: The Roman Way (1932), Ch. 1

“The management theory jungle is still with us… Perhaps the most effective way [out of the jungle] would be for leading managers to take a more active role in narrowing the widening gap… between professional practice and our college and university business”

Harold Koontz (1909–1984)

schools
Source: "The Management Theory Jungle Revisited," 1980, p. 186 ; as cited in Daniel A. Wren & Arthur G. Bedeian (2009). The evolution of management thought. p. 419-420

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George Biddell Airy photo
Charles Darwin photo

“Mr. Darwin begs me to say that he receives so many letters that he cannot answer them all. He considers that the theory of evolution is quite compatible with the belief in a God; but that you must remember that different persons have different definitions of what they mean by God.”

Charles Darwin (1809–1882) British naturalist, author of "On the origin of species, by means of natural selection"

volume I, chapter VIII: "Religion", page 307 http://darwin-online.org.uk/content/frameset?pageseq=325&itemID=F1452.1&viewtype=image; letter http://www.darwinproject.ac.uk/entry-11981 from Emma Darwin (wife) to N.A. Mengden (8 April 1879)
The Life and Letters of Charles Darwin (1887)

Amir Taheri photo

“[Islamic terrorism] is different from all other forms of terrorism in at least three important respects. First, it rejects all the contemporary ideologies in their various forms; it sees itself as the total outsider with no option but to take control or to fall, gun in hand. It cannot even enter into talks with other terrorist movements which may, in some specific cases at least, share its tactical objectives. Considering itself as an expression of Islamic revival - which must, by definition, lead to the conquest of the entire globe by the True Faith - it bases all its actions on the dictum that the end justifies the means… The second characteristic that distinguishes the Islamic version from other forms of terrorism is that it is clearly conceived and conducted as a form of Holy War which can only end when total victory has been achieved. The term 'low-intensity warfare' has often been used to describe terrorism, but it applies more specifically to the Islamic kind, which does not seek negotiations, give-and-take, the securing of specific concessions or even the mere seizure of political power within a certain number of countries… The third specific characteristic of Islamic terrorism is that it forms the basis of a whole theory of both individual conduct and of state policy. To kill the enemies of Allah and to offer the infidels the choice between converting to Islam or being put to death is the duty of every individual believer as well as the supreme - if not the sole - task of the Islamic state.”

Amir Taheri (1942) Iranian journalist

Holy Terror: The inside story of Islamic terrorism (1987)

Pierre Duhem photo

“The first question we should face is: What is the aim of a physical theory? To this question diverse answers have been made, but all of them may be reduced to two main principles:
"A physical theory," certain logicians have replied, "has for its object the explanation of a group of laws experimentally established."
"A physical theory," other thinkers have said, "is an abstract system whose aim is to summarize and classify logically a group of experimental laws without claiming to explain these laws…
Now these two questions — Does there exist a material reality distinct from sensible appearances? and What is the nature of reality? — do not have their source in experimental method, which is acquainted only with sensible appearances and can discover nothing beyond them. The resolution of these questions transcends the methods used by physics; it is the object of metaphysics.
Therefore, if the aim of physical theories is to explain experimental laws, theoretical physics is not an autonomous science; it is subordinate to metaphysics…
Now, to make physical theories depend on metaphysics is surely not the way to let them enjoy the privilege of universal consent.”

Pierre Duhem (1861–1916) French physicist, historian of science

Notice sur les Titres et Travaux scientifiques de Pierre Duhem rédigée par lui-même lors de sa candidature à l'Académie des sciences (mai 1913), The Aim and Structure of Physical Theory (1906)

Neil deGrasse Tyson photo
Rakesh Khurana photo

“Neoclassical economic theory forms the central discourse and behavioral model of contemporary management education. Drawing on research and insights from game theory and behavioral economics we have argued that many of the core assumptions underlying this model are flawed. While we cannot say that the widespread reliance on the Homo economicus model has caused the highly level of observed managerial malfeasance, it may well have, and it surely does not act as a healthy influence on managerial morality. Students have learned this flawed model and in their capacity as corporate managers, doubtless act daily in conformance with it. This, in turn, may have contributed to the weakening of socially functional values and norms like honesty, integrity, self-restraint, reciprocity and fairness, to the detriment of the health of the enterprise. Simultaneously, this perspective has legitimized, or at least not delegitimized, such behaviors as material greed and optimizing with guile. We noted that this model has become highly institutionalized in business education. Fortunately, we believe that the potential for moving away from this flawed model is significant and thus can end this chapter on a more optimistic note for the future of business education.”

Rakesh Khurana (1967) American business academic

Herbert Gintis and Rakesh Khurana. " What Happened When Homo Economicus Entered Business School https://evonomics.com/what-happens-when-you-introduce-homo-economicus-into-business/," in: evonomics.com, July 14, 2016.

Vitruvius photo
Charlie Brooker photo
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“Here is the real domino theory: Gay man to gay man, bisexual man to straight woman, addict mother to newborn baby, they all fall down and someday it will come to you.”

Anna Quindlen (1952) journalist, Novelist

The dangers of an AIDS epidemic. The New York Times, sect. A, p. 31 (December 9, 1993).

Francis Heylighen photo

“W. Ross Ashby is one of the founding fathers of both cybernetics and systems theory. He developed such fundamental ideas as the homeostat, the law of requisite variety, the principle of self-organization, and the principle of regulatory models.”

Francis Heylighen (1960) Belgian cyberneticist

" Ashby's book "Introduction to Cybernetics http://pespmc1.vub.ac.be/ASHBBOOK.html" at Principia Cybernetica Web, 1999-2003
Principia Cybernetica Web, 1999-2003

Joseph Louis Lagrange photo

“The signs on Bell’s door read “J. Bell” and “M. Bell.” I knocked and was invited in by Bell. He looked about the same as he had the last time I saw him, a couple of years ago. He has long, neatly combed red hair and a pointed beard, which give him a somewhat Shavian figura. On one wall of the office is a photograph of Bell with something that looks like a halo behind his head, and his expression in the photograph is mischievous. Theoretical physicists’ offices run the gamut from chaotic clutter to obsessive neatness; the Bells’ is somewhere in between. Bell invited me to sit down after warning me that the “visitor’s chair” tilted backward at unexpected angles. When I had mastered it, and had a chance to look around, the first thing that struck me was the absence of Mary. “Mary,” said Bell, with a note of some disbelief in his voice, “has retired.” This, it turned out, had occurred not long before my visit. “She will not look at any mathematics now. I hope she comes back,” he went on almost plaintively; “I need her. We are doing several problems together.” In recent years, the Bells have been studying new quantum mechanical effects that will become relevant for the generation of particle accelerators that will perhaps succeed the LEP. Bell began his career as a professional physicist by designing accelerators, and Mary has spent her entire career in accelerator design. A couple of years ago Bell, like the rest of the members of CERN theory division, was asked to list his physics speciality. Among the more “conventional” entries in the division such as “super strings,” “weak interactions,” “cosmology,” and the like, Bell’s read “quantum engineering.””

Jeremy Bernstein (1929) American physicist

Quantum Profiles (1991), John Stewart Bell: Quantum Engineer

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Tjalling Koopmans photo

“Econometrics may be defined as the quantitative analysis of actual economic phenomena based on the concurrent development of theory and observation, related by appropriate methods of inference.”

Tjalling Koopmans (1910–1985) Dutch American economist

Paul Samuelson, Tjalling Koopmans, and Richard Stone. "Report of the evaluative committee for Econometrica." Econometrica- journal of the Econometric Society. (1954): 141-146.

John Moffat photo
David Chalmers photo

“Closely related to the erroneous idea that science is a body of knowledge is the equally erroneous idea that scientific theories are true.”

Carroll Quigley (1910–1977) American historian

Source: The Evolution of Civilizations (1961) (Second Edition 1979), Chapter 1, Scientific Method and the Social Sciences, p. 40