Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind. These passions, like great winds, have blown me hither and thither, in a wayward course, over a deep ocean of anguish, reaching to the very verge of despair.
-Bertrand Russell
I do not know what I may appear to the world; but to myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding of a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
-Sir Isaac Newton (1642-1727)
All of physics is either impossible or trivial. It is impossible until you understand it, and then it becomes trivial.
-Ernest Rutherford
Now, my own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose. I have read and heard many attempts at a systematic account of it, from materialism and theosophy to the Christian system or that of Kant, and I have always felt that they were much too simple. I suspect that there are more things in heaven and earth that are dreamed of, or can be dreamed of, in any philosophy. That is the reason why I have no philosophy myself, and must be my excuse for dreaming.
-JS Haldane, English geneticist. Possible Worlds and other Essays. (1927)
If we take in our hand any volume -- of divinity or metaphysics, for instance -- let us ask, 'Does it contain any abstract reasoning concerning quantity or number?' No. 'Does it contain any experimental reasoning concerning matter of fact and existence?' No. Commit it then to the flames: for it can contain nothing but sophistry and illusion.
-Hume, Treatise Concerning Human Understanding.
'I know what you're thinking about,' said Tweedledum: 'but it isn't so, nohow.'
'Contrariwise,' continued Tweedledee, 'if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.'
Philosophy consists very largely of one philosopher arguing that all others are jackasses. He usually proves it, and I should add that he also usually proves that he is one himself.
-HL Mencken (1880-1956)
Philosophers say a great deal about what is absolutely necessary for science, and it is always, so far as one can see, rather naive, and probably wrong.
-RP Feynman
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It is a pleasant surprise to him (the pure mathematician) and an added problem if he finds that the arts can use his calculations, or that the senses can verify them, much as if a composer found that sailors could heave better when singing his songs.
-George Santayana
A certain impression I had of mathematicians was ... that they spent immoderate amounts of time declaring each other's work trivial.
-Richard Preston, New Yorker, 1992
It requires a very unusual mind to undertake the analysis of the obvious.
-Alfred North Whitehead (1861-1947)
Mathematical proofs like diamonds should be hard and clear, and will be touched with nothing but strict reasoning.
-John Locke
At first it seems obvious, but the more you think about it the stranger the deductions from this axiom seem to become; in the end you cease to understand what is meant by it.
-Bertrand Russell
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Never make a calculation until you know the answer.
-Wheeler and Taylor, in Spacetime Physics.
I think it is safe to say that no one understands quantum mechanics. Do not keep saying to yourself, if you can possibly avoid it, 'But how can it possibly be like that?' because you will go down the drain into a blind alley from which nobody has yet escaped. Nobody knows how it can be like that.
-RP Feynman
[During a lecture:] This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.
-Albert Einstein
Although this may seem a paradox, all exact science is dominated by the idea of approximation.
-Bertrand Russell
... they are ill discoverers that think there is no land when they can see nothing but sea.
-Francis Bacon (1561-1626)
No man can worthely praise Ptolemye ... yet muste ye and all men take heed, that both in him and in all mennes workes, you be not abused by their autoritye, but evermore attend to their reasons, and examine them well, ever regarding more what is saide, and how it is proved, than who saieth it, for autorite often times deceaveth many menne.
-Robert Record, 'The castle of knowledge' 1556
"This is the essence of science. Even though I do not understand quantum mechanics or the nerve cell membrane, I trust those who do. Most scientists are quite ignorant about most sciences but all use a shared grammar that allows them to recognize their craft when they see it. The motto of the Royal Society of London is 'Nullius in verba' : trust not in words. Observation and experiment are what count, not opinion and introspection. Few working scientists have much respect for those who try to interpret nature in metaphysical terms. For most wearers of white coats, philosophy is to science as pornography is to sex: it is cheaper, easier, and some people seem, bafflingly, to prefer it. Outside of psychology it plays almost no part in the functions of the research machine.''
-(Steve Jones, University College, London) reviewing Pinker, NYRB Nov 6 1997 p13-14