Charlie Munger at the 2019 Daily Journal Annual Meeting:

Part of the secret of a long life, that’s worked as well as mine, is not to expect too much of human nature. It’s almost bound to be a lot of defects and problems. And to have your life full of seething resentments and hatreds, it’s counterproductive. You’re punishing yourself and not fixing the world. Can you think of anything much more stupid than trying to fix the world in a way that ruins yourself and doesn’t fix the world? It’s pretty stupid.