I have lived one hundred years; and I die with the consolation of never having thrown the slightest ridicule upon the smallest virtue.

If I held all the thoughts of the world in my hand, I would be careful not to open it.

A work of morality, politics, criticism will be more elegant, other things being equal, if it is shaped by the hand of geometry.

To be happy, one must have a good stomach and a bad heart.

It takes time to ruin a world, but time is all it takes.

Mathematicians are like lovers. Grant a mathematician the least principle, and he will draw from it a consequence which you must also grant him, and from this consequence another.

A philosopher will not believe what he sees because he is too busy speculating about what he does not see.