André Weil

"God exists since mathematics is consistent, and the Devil exists since we cannot prove it."

"Rigour is to the mathematician what morality is to men."

"Every mathematician worthy of the name has experienced the state of lucid exaltation in which one thought succeeds another."

"In mathematics, we find truth more often through our mistakes than through our certainties."

"Nothing is more fruitful than these obscure analogies, these indistinct reflections of one theory into another."