Everybody likes a kidder, but nobody lends him money.
The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.
It is a profitable thing, if one is wise, to seem foolish.
Sometimes when you innovate, you make mistakes. It is best to admit them quickly, and get on with improving your other innovations.
If one sticks too rigidly to one's principles, one would hardly see anybody.
My pessimism extends to the point of even suspecting the sincerity of the pessimists.
What makes the engine go? Desire, desire, desire.