Never do to others what you would not like them to do to you.
A man should practice what he preaches, but a man should also preach what he practices.
Friendship with the upright, with the truthful and with the well informed is beneficial. Friendship with those who flatter, with those who are meek and who compromise with principles, and with those who talk cleverly is harmful.
Stars are holes in the sky from which the light of the infinite shines.
Without feelings of respect, what is there to distinguish men from beasts?
Knowledge is merely brilliance in organization of ideas and not wisdom. The truly wise person goes beyond knowledge.