Of all the things which wisdom provides to make us entirely happy, much the greatest is the possession of friendship.

It is vain to ask of the gods what man is capable of supplying for himself.

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.

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

Is God willing to prevent evil, but not able? Then he is not omnipotent. Is he able, but not willing? Then he is malevolent. Is he both able and willing? Then whence cometh evil? Is he neither able nor willing? Then why call him God?

Justice is never anything in itself, but in the dealings of men with one another in any place whatever and at any time. It is a kind of compact not to harm or be harmed.

Justice... is a kind of compact not to harm or be harmed.