All art is concerned with coming into being; for it is concerned neither with things that are, or come into being by necessity, nor with things that do so in accordance with nature.

It is our choice of good or evil that determines our character, not our opinion about good or evil.

Just as at the Olympic games it is not the handsomest or strongest men who are crowned with victory but the successful competitors, so in life it is those who act rightly who carry off all the prizes and rewards.

Happiness is a quality of the soul...not a function of one's material circumstances.

In inventing a model we may assume what we wish, but should avoid impossibilities.

The activity of God, which is transcendent in blessedness, is the activity of contemplation; and therefore among human activities that which is most akin to the divine activity of contemplation will be the greatest source of happiness.

The proof that you know something is that you are able to teach it