Misfortune seldom intrudes upon the wise man; his greatest and highest interests are directed by reason throughout the course of life.

Happiness is man's greatest aim in life. Tranquility and rationality are the cornerstones of happiness.

We begin every act of choice and avoidance from pleasure, and it is to pleasure that we return using our experience of pleasure as the criterion of every good thing.

The term "incorporeal" is properly applied only to the void, which cannot act or be acted on. Since the soul can act and be acted upon, it is corporeal.

Those desires that do not bring pain if they are not satisfied are not necessary; and they are easily thrust aside whenever to satisfy them appears difficult or likely to cause injury.

Justice has no independent existence; it results from mutual contracts, and establishes itself wherever there is a mutual engagement to guard against doing or sustaining mutual injury.

The acquisition of riches has been for many men, not an end, but a change, of troubles.