A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

The value of a college education is not the learning of many facts but the training of the mind to think

Politics is more difficult than physics.

Every day, man is making bigger and better fool-proof things, and every day, nature is making bigger and better fools. So far, I think nature is winning.

God has given me a mule-like stubbornness to stick with a difficult problem and the intuitive powers to conceptualize complex hypothetical situations in my mind.

Everything is determined, the beginning as well as the end, by forces over which we have no control. It is determined for the insect, as well as for the star. Human beings, vegetables, or cosmic dust, we all dance to a mysterious tune, intoned in the distance by an invisible piper.

A person who never made a mistake never tried anything new.