Failures, repeated failures, are sign-posts on the road to achievement. The only time you don't want to fail is the last time you try something (and it works).

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

The price of progress is trouble.

We have been measuring too much in terms of the dollar. What we should do is think in terms of useful materials-things that will be of value to us in our daily life.

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.

No one would have crossed the ocean if he could have gotten off the ship in the storm.

It doesn't matter if you try and try and try again, and fail. It does matter if you try and fail, and fail to try again.