Never injure a friend, even in jest.
O wretched man, wretched not just because of what you are, but also because you do not know how wretched you are!
Every animal loves itself.
A friend is, as it were, a second self.
Superstition is an unreasoning fear of God.
The wise man knows nothing if he cannot benefit from his wisdom. Wisdom is not only to be acquired, but also to be utilized.