It is inevitable that those to whom is vouchsafed a long life of usefulness should outlive the friends of their youth.

My boyhood life in New York City has impressed me with the popular ignorance and also with the great need of something better than local lore and weather proverbs.

As a great man's influence never ends, so also there is not definite finality, no end, to a great survey; it runs along for centuries, ever responsive to the strain of the increasing needs of a growing population and an enlarging domain.

The atmosphere is much too near for dreams. It forces us to action. It is close to us. We are in it and of it. It rouses us both to study and to do. We must know its moods and also its motive forces.

I do not think psychoanalysis has a scientific basis. If we can't explain why a cockroach decides to turn left, how can we explain why a human being decides to do something?

There's a long tradition in Western thought that humans are not shackled by biology, whereas animals are pure instinct machines.

Today the function of the artist is to bring imagination to science and science to imagination, where they meet, in the myth.

We now witness the constructive work on a foundation that will endure through the ages. That foundation is the god of science - revealed to us in terms that will harmonize with our intelligence.