We have to live with the rest of the world. And it's a mistake, in my view. Trade has generally developed in this country. We actually export 12 or 13 percent of our GDP. It was only 5 percent in 1970. But it benefits us. It benefits the rest of the world. It doesn't benefit the steelworker maybe in Ohio. And that's the problem that has to be addressed, because when you have something that's good for society, but terribly harmful for given individuals, we have got to make sure those individuals are taken care of.

I never invest in anything that I don't understand.

The problem with commodities is that you are betting on what someone else would pay for them in six months. The commodity itself isn't going to do anything for you....it is an entirely different game to buy a lump of something and hope that somebody else pays you more for that lump two years from now than it is to buy something that you expect to produce income for you over time.

If the world couldn't see your results, would you rather be thought of as the world's greatest investor but in reality have the world's worst record? Or be thought of as the world's worst investor when you were actually the best?

Every day that goes by, I mean, if you don't react to Pearl Harbor for a week or two weeks or three weeks, you're behind in the war that you otherwise would have fought.

There are three important principles to Graham's approach. [The first is to look at stocks as fractional shares of a business, which] gives you an entirely different view than most people who are in the market. [The second principle is the margin-of-safety concept, which] gives you the competitive advantage. [The third is having a true investor's attitude toward the stock market, which] if you have that attitude, you start out ahead of 99 percent of all the people who are operating in the stock market - it's an enormous advantage.

After 25 years of buying and supervising a great variety of businesses, Charlie [Munger] and I have not learned how to solve difficult business problems. What we have learned is to avoid them. To the extent we have been successful, it is because we have concentrated on identifying one-foot hurdles that we could step over rather than because we acquired any ability to clear seven-footers.