"You have been given the principles that you ought to endorse, and you have endorsed them. What kind of teacher, then, are you still waiting for in order to refer your self-improvement to him? You are …"

"It is our attitude toward events, not events themselves, which determines how we will act."

"It is not what happens to you, but how you react to it that matters."

"For there is some use even in an ass, but not so much as in an ox: there is also use in a dog, but not so much as in a slave: there is also some use in a slave, but not so much as in citizens: there i…"

"To be happy is to desire nothing, since a man who desires something is not happy, but rather miserable, if he does not get what he desires."