Plato

Love is the pursuit of the whole.

From The Symposium

Justice means minding your own business and not meddling with other men's concerns.

From The Republic

We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.

From The Symposium

Courage is knowing what not to fear.

From The Republic

Wise men speak because they have something to say; fools because they have to say something.

From The Republic

He who is not a good man will not be a good lover.

From The Symposium

The greatest thing by far is to be a master of the spoken word.

From The Symposium

He who commits injustice is ever made more wretched than he who suffers it.

From The Republic

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

From The Republic

Knowledge is the food of the soul.

From The Symposium