The first dogma which I came to disbelieve was that of free will. It seemed to me that all notions of matter were determined by the laws of dynamics and could not therefore be influenced by human wills.

Men who are unhappy, like men who sleep badly, are always proud of the fact.

What the world needs is not dogma but an attitude of scientific inquiry.

One of the symptoms of an approaching nervous breakdown is the belief that one's work is terribly important.

To like many people spontaneously and without effort is perhaps the greatest of all sources of personal happiness.

If a Black Death could be spread throughout the world once in every generation survivors could procreate freely without making the world too full.

Hegel's philosophy is so odd that one would not have expected him to be able to get sane men to accept it, but he did. He set it out with so much obscurity that people thought it must be profound. It can quite easily be expounded lucidly in words of one syllable, but then its absurdity becomes obvious.