I never thought that others would take my theories so much more seriously than I did.

The mind that opens to a new idea never returns to its original size

Our defense is not in our armaments, nor in science, nor in going underground. Our defense is in law and order.

You teach me baseball and I'll teach you relativity...No we must not. You will learn about relativity faster than I learn baseball.

I believe that whatever we do or live for has its causality; it is good, however, that we cannot see through to it.

Great spirits have always encountered violent opposition from mediocre minds.

... we will hope that future historians will explain the morbid symptoms of present-day society as the childhood ailments of an aspiring humanity, due entirely to the excessive speed at which civilization was advancing.