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Hate no one; hate their vices, not themselves.

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One is tempted to define man as a rational animal who always loses his temper when he is called upon to act in accordance with the dictates of reason.

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Among those whom I like or admire, I can find no common denominator, but among those whom I love, I can: all of them make me laugh.

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Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

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Mathematics, rightly viewed, posses not only truth, but supreme beauty - a beauty cold and austere, like that of sculpture.

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The mind of a bigot is like the pupil of the eye. The more light you shine on it, the more it will contract.

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Few people think more than two or three times a year; I have made an international reputation for myself by thinking once or twice a week.

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Refuse to be ill. Never tell people you are ill; never own it to yourself. Illness is one of those things which a man should resist on principle.

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I not only use all the brains that I have, but all that I can borrow.

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Although prepared for martyrdom, I preferred that it be postponed.

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