Diogenes Laertius

Confidence, like art, never comes from having all the answers; it comes from being open to all the questions.

Ignorance plays the chief part among men, and the multitude of words.

There is a written and an unwritten law. The one by which we regulate our constitutions in our cities is the written law; that which arises from custom is the unwritten law.

Time is the image of eternity.

One ought to seek out virtue for its own sake, without being influenced by fear or hope, or by any external influence. Moreover, that in that does happiness consist.

He calls drunkenness an expression identical with ruin.

Diogenes, when asked from what country he came, replied, "I am a citizen of the world."