Example isn't another way to teach, it is the only way to teach.

The whole of science is nothing more than a refinement of everyday thinking.

Although words exist for the most part for the transmission of ideas, there are some which produce such violent disturbance in our feelings that the role they play in the transmission of ideas is lost in the background.

Humankind's desire for peace can be realized only by the creation of a world government.

The supreme task of the physicist is to arrive at those universal elementary laws from which the cosmos can be built up by pure deduction. There is no logical path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them.

Many of the things you can count, don't count. Many of the things you can't count, really count.

I do not believe that civilization will be wiped out in a war fought with the atomic bomb. Perhaps two-thirds of the people of the earth will be killed.