Epictetus — "We are not to be disturbed by the things that happen, but by the opinions which …"

"For where you find unrest, grief, fear, frustrated desire, failed aversion, jealousy and envy, happiness has no room for admittance. And where values are false, these passions inevitably follow."

"Protect what belongs to you at all costs; don't desire what belongs to another."

"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 …"

"If you have assumed a character beyond your strength, you have both played a poor figure in that, and neglected one that is within your powers."

"When you have to deal with a man who is angry, remember that he is not angry with you, but with himself; he is only venting his anger on you."