Socrates

The unexamined life is not worth living.

I know that I am intelligent, because I know that I know nothing.

There is only one good, knowledge, and one evil, ignorance.

The only true wisdom is in knowing you know nothing.

By all means marry; if you get a good wife, you'll become happy; if you get a bad one, you'll become a philosopher.

An unexamined life is not worth living.

To find yourself, think for yourself.

The highest realms of thought are impossible to reach without first attaining an understanding of yourself.

Contentment is natural wealth, luxury is artificial poverty.

Strong minds discuss ideas, average minds discuss events, weak minds discuss people.

The only good is knowledge and the only evil is ignorance.

Know thyself.

Education is the kindling of a flame, not the filling of a vessel.

He who is not contented with what he has, would not be contented with what he would like to have.

The secret of happiness, you see, is not found in seeking more, but in developing the capacity to enjoy less.

I am not an Athenian or a Greek, but a citizen of the world.

Prefer knowledge to wealth, for the one is transitory, the other perpetual.

The way to gain a good reputation is to endeavor to be what you desire to appear.

False words are not only evil in themselves, but they infect the soul with evil.

From the deepest desires often come the deadliest hate.