Music is to the mind as air is to the body.

Apply yourself both now and in the next life. Without effort, you cannot be prosperous. Though the land be good, you cannot have an abundant crop without cultivation.

He is unworthy of the name of man who is ignorant of the fact that the diagonal of a square is incommensurable with its side.

A certain portion of mankind do not believe at all in the existence of the gods.

I can show you that the art of calculation has to do with odd and even numbers in their numerical relations to themselves and to each other.

Is it not also true that no physician, in so far as he is a physician, considers or enjoins what is for the physician's interest, but that all seek the good of their patients? For we have agreed that a physician strictly so called, is a ruler of bodies, and not a maker of money, have we not?

Cunning... is but the low mimic of wisdom.