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“No mathematician should ever allow him to forget that mathematics, more than any other art or science, is a young man's game. 鈥� Galois died at twenty-one, Abel at twenty-seven, Ramanujan at thirty-three, Riemann at forty. There have been men who have done great work later; 鈥� [but] I do not know of a single instance of a major mathematical advance initiated by a man past fifty. 鈥� A mathematician may still be competent enough at sixty, but it is useless to expect him to have original ideas.”
― G.H. Hardy, A Mathematician's Apology

“The analytical geometry of Descartes and the calculus of Newton and Leibniz have expanded into the marvelous mathematical method鈥攎ore daring than anything that the history of philosophy records鈥攐f Lobachevsky and Riemann, Gauss and Sylvester. Indeed, mathematics, the indispensable tool of the sciences, defying the senses to follow its splendid flights, is demonstrating today, as it never has been demonstrated before, the supremacy of the pure reason.”
― Nicholas Murray Butler

“The best that Gauss has given us was likewise an exclusive production. If he had not created his geometry of surfaces, which served Riemann as a basis, it is scarcely conceivable that anyone else would have discovered it. I do not hesitate to confess that to a certain extent a similar pleasure may be found by absorbing ourselves in questions of pure geometry.”
― Albert Einstein

“Does anyone believe that the difference between the Lebesgue and Riemann integrals can have physical significance, and that whether say, an airplane would or would not fly could depend on this difference? If such were claimed, I should not care to fly in that plane.”
― Richard W. Hamming