Let no one delay the study of philosophy while young nor weary of it when old.

Without confidence, there is no friendship.

Do not spoil what you have by desiring what you have not; remember that what you now have was once among the things you only hoped for.

We must meditate on what brings happiness, since when it has, it has everything, and when he misses, we do everything to have it

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.

It is impossible for someone to dispel his fears about the most important matters if he doesn't know the nature of the universe but still gives some credence to myths. So without the study of nature there is no enjoyment of pure pleasure.

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