One who scorns the power of intuition will never rise above the ranks of journeyman calculator.

A perfection of means, and confusion of aims, seems to be our main problem.

There is nothing divine about morality; it is a purely human affair. If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed. What the individual can do is to give a fine example, and to have the courage to uphold ethical values .. in a society of cynics.

Adversity introduces a man to himself.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

The value of achievement lies in the achieving.

I was sitting in a chair in the patent office at Bern when all of a sudden a thought occurred to me: "If a person falls freely he will not feel his own weight." I was startled. This simple thought made a deep impression on me. It impelled me toward a theory of gravitation.