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

Action without intelligence is a form of insanity, but intelligence without action is the greatest form of stupidity in the world.

This problem, too, will look simple after it is solved.

A research problem is not solved by apparatus; it is solved in a man's head.

The person who doesn't know something can't be done will often find a way to go ahead and do it.

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

We need to teach the highly educated man that it is not a disgrace to fail and that he must analyze every failure to find its cause. He must learn how to fail intelligently, for failing is one of the greatest arts in the world.