Never depend on a single source of income.

We like to buy businesses, but we don't like to sell them.

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

A hyperactive stock market is the pickpocket of enterprise.

And people really behaved in a fraudulent way or something, we'll go back and find the culprits later on. But that really isn't the problem we have. I mean that's where it came from, though. We leveraged up and if you have a 20 percent fall in value of a $20 trillion asset, that's $4 trillion. And when $4 trillion lands - losses land in the wrong part of this economy, it can gum up the whole place.

The worst sort of business is one that grows rapidly, requires significant capital to engender the growth, and then earns little or no money. Think airlines. Here a durable competitive advantage has proven elusive ever since the days of the Wright Brothers. Indeed, if a farsighted capitalist had been present at Kitty Hawk, he would have done his successors a huge favor by shooting Orville down.

When people talk about cash being king, it's not king if it just sits there and never does anything.