Charlie Munger : Art of Stock Picking: "What is elementary, worldly wisdom? Well, the first rule is that you can't really know anything if you just remember isolated facts and try and bang 'em back. If the facts don't hang together o�n a latticework of theory, you don't have them in a usable form.
You've got to have models in your head. And you've got to array your experience both vicarious and direct o�n this latticework of models. You may have noticed students who just try to remember and pound back what is remembered. Well, they fail in school and in life. You've got to hang experience o�n a latticework of models in your head.
What are the models? Well, the first rule is that you've got to have multiple models because if you just have o�ne or two that you're using, the nature of human psychology is such that you'll torture reality so that it fits your models, or at least you'll think it does. You become the equivalent of a chiropractor who, of course, is the great boob in medicine.
It's like the old saying, 'To the man with o�nly a hammer, every problem looks like a nail. 'And of course, that's the way the chiropractor goes about practicing medicine. But that's a perfectly disastrous way to think and a perfectly disastrous way to operate in the world. So you've got to have multiple models.
And the models have to come from multiple disciplines because all the wisdom of the world is not to be found in o�ne little academic department. That's why poetry professors, by and large, are so unwise in a worldly sense. They don't have enough models in their heads. So you've got to have models across a fair array of disciplines. "
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