If anything, I now believe even more strongly that 1) reliability is essential for progress in life and 2) while quantum mechanics is unlearnable for… - Charlie Munger

It's not the bad ideas that do you in, it’s the good ideas. And you may say, 'That can't be so. That's paradoxical. What he [Graham] meant was that if a thing is a bad idea, it’s hard to overdo. But where there is a good idea with a core of essential and important truth, you can’t ignore it. And then it's so easy to overdo it. So the good ideas are a wonderful way to suffer terribly if you overdo them

And he will also suffer from the psychological defect caught by the proverb “To a man with a hammer, every problem looks like a nail.” The fifth helpful notion is that really big effects, lollapalooza effects, will often come only from large combinations of factors.

Some of the worst dysfunctions in businesses come from the fact that they balkanize reality into little individual departments, with territoriality and turf protection and so forth. So if you want to be a good thinker, you must develop a mind that can jump the jurisdictional boundaries. You don’t have to know it all. Just take in the best big ideas from all these disciplines. And it’s not that hard to do.