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 world is not threatened by evil people, but by those who allow evil to take place.

Considered logically this concept is not identical with the totality of sense impressions referred to; but it is an arbitrary creation of the human (or animal) mind.

Scientific research can reduce superstition by encouraging people to think and view things in terms of cause and effect.

No path leads from a knowledge of that which is to that which should be.

In the middle of difficulties lie opportunities.

The health of society thus depends quite as much on the independence of the individuals composing it as on their close political cohesion.