You are mistaken, my friend, if you think that a man who is worth anything ought to spend his time weighing up the prospects of life and death. He has only one thing to consider in performing any action - that is, whether he is acting rightly or wrongly, like a good man or a bad one.

No one ever teaches well who wants to teach, or governs well who wants to govern.

Of all the animals, the boy is the most unmanageable.

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

To the rulers of the state then, if to any, it belongs of right to use falsehood, to deceive either enemies or their own citizens, for the good of the state: and no one else may meddle with this privilege.

No one is more hated than he who speaks the truth.

Mathematics is the language in which the gods talk to people.