One could perhaps describe the situation by saying that God is a mathematician of a very high order, and He used very advanced mathematics in constructing the universe.

Scientific progress is measured in units of courage, not intelligence.

A termination of one's life is necessary in the scheme of things to provide a logical reason for unselfishness. . . . The fact that there is an end to one's life compels one to take an interest in things that will continue to live after one is dead.

Hopes are always accompanied by fears, and, in scientific research, the fears are liable to become dominant.

There is in my opinion a great similarity between the problems provided by the mysterious behavior of the atom and those provided by the present economic paradoxes confronting the world.

It is more important to have beauty in one's equations than to have them fit experiment.

Living is worthwhile if one can contribute in some small way to this endless chain of progress.