The Wright brothers flew right through the smoke screen of impossibility.

I could do nothing without my problems; they toughen my mind. In fact, I tell my assistants not to bring me their successes for they weaken me, but rather to bring me their problems, for they strengthen me.

The only time you mustn't fail is the last time you try.

An inventor fails 999 times, and if he succeeds once, he's in. He treats his failures simply as practice shots.

Bankers regard research as most dangerous a thing that makes banking hazardous due to the rapid changes it brings about in industry.

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

The price of progress is trouble.