“The supreme task of the physicist is to arrive at those universal elementary laws from which the cosmos can be built up by pure deduction. There is no logical path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them.”

— Albert Einstein

Variant, from Preface to Max Planck's Where is Science Going? (1933): The supreme task of the physicist is the discovery of the most general elementary laws from which the world-picture can be deduced logically. But there is no logical way to the discovery of these elemental laws. There is only the way of intuition, which is helped by a feeling for the order lying behind the appearance, and this Einfühlung [literally, empathy or 'feeling one's way in']' is developed by experience.
1910s, Principles of Research (1918)
Context: The supreme task of the physicist is to arrive at those universal elementary laws from which the cosmos can be built up by pure deduction. There is no logical path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them. In this methodological uncertainty, one might suppose that there were any number of possible systems of theoretical physics all equally well justified; and this opinion is no doubt correct, theoretically. But the development of physics has shown that at any given moment, out of all conceivable constructions, a single one has always proved itself decidedly superior to all the rest.

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Albert Einstein 702

German-born physicist and founder of the theory of relativi… 1879–1955

Ludwig von Bertalanffy (1901–1972) austrian biologist and philosopher

Source: 1920s, Kritische Theorie der Formbildung (1928, 1933), p. 91; as cited in: M. Drack, W. Apfalter, D. Pouvreau (2007) " On the making of a system theory of life: Paul A Weiss and Ludwig von Bertalanffy's conceptual connection http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2874664/". in: Q Rev Biol. 2007 December; 82(4): 349–373.

“Dimensionless constants in the laws of nature, which from the purely logical point of view can just as well have different values, should not exist.”

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

German orgiginal: Dimensionslose Konstanten in den Naturgesetzen, die vom rein logischen Standpunkt aus ebensogut andere Werte haben können, dürfte es nicht geben.
As quoted in Begegnungen mit Einstein, von Laue, und Planck (1988) by Ilse Rosenthal-Schneider, p. 31, English edition Reality and Scientific Truth : Discussions with Einstein, von Laue, and Planck (1980) by Ilse Rosenthal-Schneider
Attributed in posthumous publications

“In a certain sense all knowledge is inductive. We can only learn the laws and relations of things in nature by observing those things. But the knowledge gained from the senses is knowledge only of particular facts, and we require some process of reasoning by which we may collect out of the facts the laws obeyed by them. Experience gives us the materials of knowledge: induction digests those materials, and yields us general knowledge. When we possess such knowledge, in the form of general propositions and natural laws, we can usefully apply the reverse process of deduction to ascertain the exact information required at any moment. In its ultimate foundation, then, all knowledge is inductive—in the sense that it is derived by a certain inductive reasoning from the facts of experience.”

William Stanley Jevons (1835–1882) English economist and logician

Source: The Principles of Science: A Treatise on Logic and Scientific Method (1874) Vol. 1, p. 14

“Many people think that the progress of the human race is based on experiences of an empirical, critical nature, but I say that true knowledge is to be had only through a philosophy of deduction. For it is intuition that improves the world, not just following a trodden path of thought. Intuition makes us look at unrelated facts and then think about them until they can all be brought under one law. To look for related facts means holding onto what one has instead of searching for new facts. Intuition is the father of new knowledge, while empiricism is nothing but an accumulation of old knowledge. Intuition, not intellect, is the 'open sesame' of yourself.”

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

Source: Attributed in posthumous publications, Einstein and the Poet (1983), p. 16

“I didn't arrive at my understanding of the fundamental laws of the universe through my rational mind.”

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

“Those who seek a pro-life culture must accept that we will never persuade all 300 million Americans to agree with us. A pro-life culture can be built only from the ground up, person by person. For too long we have viewed the battle as purely political, but no political victory can change a degraded society. No Supreme Court ruling by itself can instill greater respect for life. And no Supreme Court justice can save our freedoms if we don't fight for them ourselves.”

Ron Paul (1935) American politician and physician

Federalizing Social Policy, January 30, 2006 http://www.house.gov/paul/tst/tst2006/tst013006.htm
2000s, 2006-2009

“So much of modern mathematical work is obviously on the border-line of logic, so much of modern logic is symbolic and formal, that the very close relationship of logic and mathematics has become obvious to every instructed student. The proof of their identity is, of course, a matter of detail: starting with premisses which would be universally admitted to belong to logic, and arriving by deduction at results which as obviously belong to mathematics, we find that there is no point at which a sharp line can be drawn, with logic to the left and mathematics to the right. If there are still those who do not admit the identity of logic and mathematics, we may challenge them to indicate at what point, in the successive definitions and deductions of Principia Mathematica, they consider that logic ends and mathematics begins. It will then be obvious that any answer must be quite arbitrary.”

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

Source: 1910s, Introduction to Mathematical Philosophy (1919), Ch. 18: Mathematics and Logic

“Only mathematics and mathematical logic can say as little as the physicist means to say.”

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

The Scientific Outlook (1931)
1930s
Context: Ordinary language is totally unsuited for expressing what physics really asserts, since the words of everyday life are not sufficiently abstract. Only mathematics and mathematical logic can say as little as the physicist means to say.

“There is … only a single categorical imperative and it is this: Act only on that maxim through which you can at the same time will that it should become a universal law.”

Immanuel Kant (1724–1804) German philosopher

Der kategorische Imperativ, der überhaupt nur aussagt, was Verbindlichkeit sei, ist: handle nach einer Maxime, welche zugleich als ein allgemeines Gesetz gelten kann.
Source: Metaphysics of Morals (1797), Ch. 11

“When repeated experiments have failed, when every policy that has been proposed as a remedy for the ills of Ireland has been tried in succession and found wanting, is it not time to try some other experiment? I think the only experiment that can be tried is to make the Irish people masters of their own fortunes. Throw responsibility upon them, make them feel that it is to their interest to preserve law and order. Make them feel that the laws they are to obey are laws made by themselves, and that if they adopt a policy it will not be reversed by people sitting at Westminster, who have not that intimate knowledge of Irish conditions and wishes which can be possessed only by those who live in the midst of the people.”

James Bryce, 1st Viscount Bryce (1838–1922) British academic, jurist, historian and Liberal politician

Speech https://api.parliament.uk/historic-hansard/lords/1921/dec/15/address-in-reply-to-his-majestys-most#column_112 in the House of Lords (15 December 1921).
1920s

“The supreme task of the physicist is to arrive at those universal elementary laws from which the cosmos can be built up by pure deduction. There is no logical path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them.”

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