Sometimes the answer to fear does not lie in trying to explain away the causes, sometimes the answer lies in courage.

We may anticipate a state of affairs in which two Great Powers will each be in a position to put an end to the civilization and life of the other, though not without risking its own. We may be likened to two scorpions in a bottle, each capable of killing the other, but only at the risk of his own life.

In a free world, if it is to remain free, we must maintain, with our lives if need be, but surely by our lives, the opportunity for a man to learn anything

It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them.

A pragmatist is concerned with results, not reality.

The theory of our modern technic shows that nothing is as practical as theory.

The atomic bomb made the prospect of future war unendurable. It has led us up those last few steps to the mountain pass; and beyond there is a different country.