A man is rational in proportion as his intelligence informs and controls his desires.

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

A man without a bias cannot write interesting history - if indeed such a man exists.

It is the things for which there is no evidence that are believed with passion.

I think the subject which will be of most importance politically is mass psychology.... Its importance has been enormously increased by the growth of modern methods of propaganda. Of these the most influential is what is called 'education.' Religion plays a part, though a diminishing one; the press, the cinema, and the radio play an increasing part.... It may be hoped that in time anybody will be able to persuade anybody of anything if he can catch the patient young and is provided by the State with money and equipment.

If you had the power to destroy the world, would you do so?

War grows out of ordinary human nature.