Wise leaders generally have wise counselors because it takes a wise person themselves to distinguish them.

Antisthenes used to say that envious people were devoured by their own disposition, just as iron is by rust. Envy of others comes from comparing what they have with what the envious person has, rather than the envious person realising they have more than what they could have and certainly more than some others and being grateful. It is really just an inability to get a correct perspective on their lives.

As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task.

Discourse on virtue and they pass by in droves. Whistle and dance the shimmy, and you've got an audience.

You will become a teacher of yourself when for the same things that you blame others, you also blame yourself.

Why not whip the teacher when the pupil misbehaves?

Calumny is only the noise of madmen.