"If a man is unhappy, this must be due to his own fault, that he has forgotten that all things are in his own power."

"What do you want to be? A philosopher? Then do what philosophers do."

"If you would not be a man of many words, be a man of many deeds."

"Know, first, who you are, and then adorn yourself accordingly."

"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 …"