Modesty in women has two special advantages,--it enhances beauty and veils uncomeliness.

Leibniz never married; he had considered it at the age of fifty; but the person he had in mind asked for time to reflect. This gave Leibniz time to reflect, too, and so he never married.

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

Nature is never so admired as when she is understood.

We must always skim over pleasures. They are like marshy lands that we must travel nimbly, hardly daring to put down our feet.

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

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.