Geometry will draw the soul toward truth and create the spirit of philosophy.

Let no one destitute of geometry enter my doors.

Don't ask a poet to explain himself. He cannot.

To prefer evil to good is not in human nature; and when a man is compelled to choose one of two evils, no one will choose the greater when he might have the less.

Moderation, which consists in indifference about little things, and in a prudent and well-proportioned zeal about things of importance, can proceed from nothing but true knowledge, which has its foundation in self-acquaintance.

Our need will be the real creator.

There's a victory and defeat-the first and best of victories, the lowest and worst of defeats-which each man gains or sustains at the hands not of another, but of himself.