When the solution is simple, God is answering.

The stakes are immense, the task colossal, the time is short. But we may hope - we must hope - that man's own creation, man's own genius, will not destroy him.

Since the mathematicians have invaded the theory of relativity I do not understand it myself any more.

The content of scientific theory itself offers no moral foundation for the personal conduct of life.

Politics is more difficult than physics.

Nature hides her secrets because of her essential loftiness, but not by means of ruse.

Solutions to tough problems should be made as simple as possible - and no simpler.