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.