The proof that you know something is that you are able to teach it

People do not naturally become morally excellent or practically wise. They become so, if at all, only as the result of lifelong personal and community effort.

It is clear, then, that wisdom is knowledge having to do with certain principles and causes. But now, since it is this knowledge that we are seeking, we must consider the following point: of what kind of principles and of what kind of causes is wisdom the knowledge?

To leave the number of births unrestricted, as is done in most states, inevitably causes poverty among the citizens, and poverty produces crime and faction.

When you ask a dumb question, you get a smart answer.

Music directly represents the passions of the soul. If one listens to the wrong kind of music, he will become the wrong kind of person.

The happy man . . . will be always or at least most often employed in doing and contemplating the things that are in conformity with virtue. And he will bear changes of fortunes most nobly, and with perfect propriety in every way.