You can't maintain strong beliefs about the world unless you also maintain strong beliefs about yourself. Having conviction in your thinking goes hand-in-hand

You can't maintain strong beliefs about the world unless you also maintain strong beliefs about yourself. Having conviction in your thinking goes hand-in-hand with some ego or self-confidence. It's a great advantage to have, but also a potential weakness too. This is why talented contrarian value investors like Buffett and Charlie Munger share a similar style -- when they have a strong opinion on something it's real hard to turn them back or convince them otherwise, so it's dangerous for the few times that they're actually wrong. But they're also very aware of this potential weakness in themselves (it's mentioned in Alice Schroeder's biography) and they've turned out to be right far more often than they've been wrong, so it works out.