Quote from Warren Buffet’s 2011 interview taken from Farnam Street’s article What makes Warren Buffett a great investor? Is it the intelligence or the discipline?.
The good news I can tell you is that to be a great investor you don’t have to have a terrific IQ. If you’ve got 160 IQ, sell 30 points to somebody else because you won’t need it in investing. What you do need is the right temperament. You need to be able to detach yourself from the views of others or the opinions of others. You need to be able to look at the facts about a business, about an industry, and evaluate a business unaffected by what other people think. That is very difficult for most people. Most people have, sometimes, a herd mentality which can, under certain circumstances, develop into delusional behavior. You saw that in the Internet craze and so on. I’m sure everybody in this room has the intelligence to do extremely well in investments. The ones that have the edge are the ones who really have the temperament to look at a business, look at an industry and not care what the person next to them thinks about it, not care what they read about it in the newspaper, not care what they hear about it on the television, not listen to people who say, “This is going to happen,” or, “That’s going to happen.” You have to come to your own conclusions, and you have to do it based on facts that are available. If you don’t have enough facts to reach a conclusion, you forget it. You go on to the next one. You have to also have the willingness to walk away from things that other people think are very simple.