Plato

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.

The wisest have the most authority.

For the introduction of a new kind of music must be shunned as imperiling the whole state; since styles of music are never disturbed without affecting the most important political institutions.

They deem him their worst enemy who tells them the truth.

Let us describe the education of our men. What then is the education to be? Perhaps we could hardly find a better than that which the experience of the past has already discovered, which consists, I believe, in gymnastic, for the body, and music for the mind.

The greatest penalty of evil-doing is to grow into the likeness of a bad man.

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.

Let no one ignorant of Mathematics enter here.

In order to seek one's own direction, one must simplify the mechanics of ordinary, everyday life.

A dog has the soul of a philosopher.

The judge should not be young, he should have learned to know evil, not from his own soul, but from late and long observation of the nature of evil in others.

The direction in which education starts a man will determine his future life.

A good decision is based on knowledge, and not on numbers.

Beauty of style and harmony and grace and good rhythm depend on Simplicity.

The measure of a man is what he does with power.