Everybody's got a different circle of competence. The important thing is not how big the circle is. The important thing is staying inside the circle.

Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

A clever person solves a problem. A wise person avoids it.

If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.

If you can't explain it to a six year old, you don't understand it yourself.