The feeling of failure is also un-Stoic. Meditate on how you can correct yourself in the future.

He’s actually very reasonable and empathetic about it. It’s much more “Don’t hurt yourself, emotionally” than “Don’t let yourself feel anything at all.”

Say to yourself in the early morning: I shall meet today ungrateful, violent, treacherous, envious, uncharitable men. All of these things have come upon them through ignorance of real good and ill… I can neither be harmed by any of them, for no man will involve me in wrong, nor can I be angry with my kinsman or hate him; for we have come into the world to work together.