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.

Both the man of science and the man of action live always at the edge of mystery, surrounded by it.

A pragmatist is concerned with results, not reality.

The most beautiful philosophical song existing in any known tongue.

The history of science is rich in example of the fruitfulness of bringing two sets of techniques, two sets of ideas, developed in separate contexts for the pursuit of new truth, into touch with one another.

Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search.

We know too much for one man to know too much.