Must not all things at the last be swallowed up in death?

Let no-one ignorant of geometry enter. Said to have been inscribed above the door of Plato's Academy.

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.

As wolves love lambs so lovers love their loves.

We must, if we are to be consistent, and if we re to have a real pedigree herd, mate the best of our men with the best of our women as often as possible, and the inferior men with the inferior women as seldom as possible, and keep only the offspring of the best.

Courage is knowing what to fear.

Ignorance: the root of all evil.