The world we have created is a product of our thinking.

Show me a satisfied man, and I'll show you a failure.

I came to America because of the great, great freedom which I heard existed in this country. I made a mistake in selecting America as a land of freedom, a mistake I cannot repair in the balance of my lifetime.

The most superior of scientific goals is to embrace a maximum of experiment with a minimum of hypotheses.

The greater the doubt, the greater the awakening

Physics is an attempt conceptually to grasp reality as something that is considered to be independent of its being observed. In this sense one speaks of physical reality.

All that is valuable in human society depends upon the opportunity for development accorded the individual.