Envy, resentment, revenge, and self-pity are disastrous modes of thought.

Mental loops that trap your own mind

Most of us learn the obvious lesson about envy and revenge early on—they're supposed to be bad for you. But what Charlie Munger is really pointing out is how these feelings function as a kind of mental poison that spreads. When you resent someone's success, you're not actually hurting them. You're just spending your own mental energy on a loop that keeps you stuck. Self-pity works the same way. It feels like self-compassion, but it's actually self-imprisonment. You're building a story where you're a victim, and that story hardens with every retelling.

The less obvious part is that these aren't just emotions you feel—they're modes of thought. They're habits of attention. Every time you catch yourself spiraling into resentment about what someone else has, or revenge fantasies, or dwelling on how unfairly you've been treated, you're training your brain to keep doing exactly that. You're literally rewiring what your mind defaults to.

The practical move isn't to white-knuckle your way to positivity. It's to notice when you're in one of these mental loops and quietly redirect—not because you're being virtuous, but because you want your thinking pointed somewhere that actually works for you.