If you have the opportunities of Berkshire, an investment in gold is dumb.

The game of investing is one of making better predictions about the future than other people. How are you going to do that? One way is to limit your tries to areas of competence. If you try to predict the future of everything, you attempt too much.

Finding a single investment that will return 20% per year for 40 years tends to happen only in dreamland. In the real world, you uncover an opportunity, and then you compare other opportunities with that. And you only invest in the most attractive opportunities. That's your opportunity cost. That's what you learn in freshman economics. The game hasn't changed at all. That's why Modern Portfolio Theory is so asinine.

I never allow myself to have an opinion on anything that I don't know the other side's argument better than they do.

With so much money riding on reported numbers, human nature is to manipulate them. And with so many doing it, you get Serpico effects, where everyone rationalizes that it's okay because everyone else is doing it. It is always thus.

To the man with only a hammer, every problem looks like a nail.

I believe that we are at or near the apex of a great civilization... In 50-100 years, if we're a poor third to some countries in Asia, I wouldn't be surprised. If I had to bet, the part of the world that will do best will be Asia.