Suppose you were a real estate investor with a 1/3 interest in the best apartment complex in town, the best mall, and the best office building. Would you feel like a poor, undiversified investor? No! But as soon as you get into stocks, people feel this way. Partly, people need to justify their fees.
Charlie MungerSince those donโt hit financial reports, the opportunities you had but didnโt accept, most people donโt bother thinking about them very much. At least that is a mistake we donโt make. We rub our own noses in our mistakes in blowing opportunities, as we just did.
Charlie MungerAnother thing I think should be avoided is extremely intense ideology because it cabbages up one's mind. You see it a lot with T.V. preachers (many have minds made of cabbage) but it can also happen with political ideology. When you're young it's easy to drift into loyalties and when you announce that you're a loyal member and you start shouting the orthodox ideology out, what you're doing is pounding it in, pounding it in, and you're gradually ruining your mind. So you want to be very, very careful of this ideology. It's a big danger.
Charlie Munger