Every honest researcher I know admits he's just a professional amateur. He's doing whatever he's doing for the first time. That makes him an amateur. He has sense enough to know that he's going to have a lot of trouble, so that makes him a professional.

Every time you tear a leaf off a calendar, you present a new place for new ideas and progress.

In America we can say what we think, and even if we can't think, we can say it anyhow.

Education is man's going forward from cocksure ignorance to thoughtful uncertainty.Where there is an open mind there will always be a frontier.

We have a lot of people revolutionizing the world because they've never had to present a working model.

Do not bring me your successes; they weaken me. Bring me your problems; they strengthen me.

A man must have a certain amount of intelligent ignorance to get anywhere.