You must be aware that most men (and also not only a few women) are by nature not monogamous. This nature makes itself even more forceful when tradition and circumstance stand in an individual's way.

It is easier to denature plutonium than to denature the evil spirit of man.

Fantasie is belangrijker dan kennis, want kennis is begrensd.

When a man, after long years of searching, chances upon a thought which discloses something of the beauty of this mysterious universe, he should not therefore be personally celebrated. He is already sufficiently paid by his experience of seeking and finding.

But the personality that finally emerges is largely formed by the environment in which a man happens to find himself during his development, by the structure of the society in which he grows up, by the tradition of that society, and by its appraisal of particular types of behavior.

Politics is a pendulum whose swings between anarchy and tyranny are fueled by perennially rejuvenated illusions.

Mankind must give up war in the Atomic Era. What is at stake is the life or death of humanity.