Math quotes
There are three kinds of lies: lies, damned lies, and statistics.
--Benjamin Disraeli 
Mathematics is written for mathematicians.
--Nicholaus Copernicus
We come now to the question: what is a priori certain or necessary, respectively in geometry (doctrine of space) or its foundations? Formerly we thought everything; nowadays we think nothing. Already the distance-concept is logically arbitrary; there need be no things that correspond to it, even approximately.
--Albert Einstein
For twenty pages perhaps, he read slowly, carefully, dutifully, with pauses for self-examination and working out examples. Then, just as it was working up and the pauses should have been more scrupulous than ever, a kind of swoon and ecstasy would fall on him, and he read ravening on, sitting up till dawn to finish the book, as though it were a novel. After that his passion was stayed; the book went back to the Library and he was done with mathematics till the next bout. Not much remained with him after these orgies, but something remained: a sensation in the mind, a worshiping acknowledgment of something isolated and unassailable, or a remembered mental joy at the rightness of thoughts coming together to a conclusion, accurate thoughts, thoughts in just intonation, coming together like unaccompanied voices coming to a close.
--Sylvia Townsend Warner
I am interested in mathematics only as a creative art.
--Godfrey H. Hardy
Cogito Ergo Sum. "I think, therefore I am."
--René Descartes
For a physicist mathematics is not just a tool by means of which phenomena can be calculated, it is the main source of concepts and principles by means of which new theories can be created.
--Freeman Dyson
Contradiction is not a sign of falsity, nor the lack of contradiction a sign of truth.
--Blaise Pascal
[attributed to him by H.B Lbsen] Theory attracts practice as the magnet attracts iron.
--Karl Friedrich Gauss
There can never be surprises in logic.
--Ludwig Wittgenstein
What if angry vectors veer Round your sleeping head, and form. There's never need to fear Violence of the poor world's abstract storm.
--Robert Penn Warren
Whenever you can, count.
--Francis Galton
The greatest unsolved theorem in mathematics is why some people are better at it than others.
--Adrian Mathesis
The search for truth is more precious than its possession.
--Albert Einstein
The riddle does not exist. If a question can be put at all, then it can also be answered.
--Ludwig Wittgenstein
Logic, like whiskey, loses its beneficial effect when taken in too large quantities.
--Lord Dunsany
A man is like a fraction whose numerator is what he is and whose denominator is what he thinks of himself. The larger the denominator the smaller the fraction.
--Leo Tolstoy
Standard mathematics has recently been rendered obsolete by the discovery that for years we have been writing the numeral five backward. This has led to reevaluation of counting as a method of getting from one to ten. Students are taught advanced concepts of Boolean algebra, and formerly unsolvable equations are dealt with by threats of reprisals.
--Woody Allen
It is the merest truism, evident at once to unsophisticated observation, that mathematics is a human invention.
--P. W. Bridgman
A time will however come (as I believe) when physiology will invade and destroy mathematical physics, as the latter has destroyed geometry.
--John Burdon Sanderson Haldane
[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
In my experience most mathematicians are intellectually lazy and especially dislike reading experimental papers. He (Ren Thom) seemed to have very strong biological intuitions but unfortunately of negative sign.
--Francis Harry Compton Crick
Mathematical rigor is like clothing; in its style it ought to suit the occasion, and it diminishes comfort and restrains freedom of movement if it is either too loose or too tight.
--G. F. Simmons
The whole is more than the sum of its parts.
--Aristotle
Apart from blunt truth, our lives sink decadently amid the perfume of hints and suggestions.
--Alfred North Whitehead