Organized common (or uncommon) sense -- very basic knowledge -- is an enormously powerful tool. There are huge dangers with computers. People calculate too much and think too little.

Understanding how to be a good investor makes you a better business manager and vice versa.

The harder you work, the more confidence you get. But you may be working hard on something that is false.

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

Avoid evil, particularly if they're attractive members of the opposite sex.

Choose clients as you would friends.

In engineering, people have a big margin of safety. But in the financial world, people don't give a damn about safety. They let it balloon and balloon and balloon. It's aided by false accounting.