For I am not Eternity, but a human being — a part of the whole, as an hour is part of the day. I must come like the hour, and like the hour must pass! - Epictetus

When you are feeling upset, angry, or sad, don’t blame another for your state of mind. Your condition is the result of your own opinions and interpretations.

What, for instance, does it mean to be insulted? [29] Stand by a rock and insult it, and what have you accomplished? If someone responds to insult like a rock, what has the abuser gained with his invective? If, however, he has his victim’s weakness to exploit, then his efforts are worth his while.

Don't live by your own rules, but in harmony with nature