The most essential characteristic of scientific technique is that it proceeds from experiment, not from tradition.

The significance of a fact is relative to [the general body of scientific] knowledge. To say that a fact is significant in science, is to say that it helps to establish or refute some general law; for science, though it starts from observation of the particular, is not concerned essentially with the particular, but with the general. A fact, in science, is not a mere fact, but an instance. In this the scientist differs from the artist, who, if he deigns to notice facts at all, is likely to notice them in all their particularity.

The moral thing I should wish to say to them is very simple; I should say: "Love is wise - Hatred is foolish." In this world, which is getting more and more closely interconnected, we have to learn to tolerate each other.

Thought is great and swift and free, the light of the world, the chief glory of man.

I am sometimes shocked by the blasphemies of those who think themselves pious.

The difficulty is old, but none the less real. An omnipotent being who created a world containing evil not due to sin must Himself be at least partially evil.

To discover a system for the avoidance of war is a vital need of our civilisation.