The psychology of adultery has been falsified by conventional morals, which assume, in monogamous countries, that attraction to one person cannot coexist with affection for another. Everybody knows that this is untrue.

Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.

If all our happiness is bound up entirely in our personal circumstances it is difficult not to demand of life more than it has to give.

In all the creative work that I have done, what has come first is a problem, a puzzle involving discomfort.

There are certain things that our age needs, and certain things that it should avoid. It needs compassion and a wish that mankind should be happy; it needs the desire for knowledge and the determination to eschew pleasant myths; it needs, above all, courageous hope and the impulse to creativeness.

The question of "unreality"is a very important one. Misled by grammar, the great majority of those logicians who have dealt with this question have dealt with it on mistaken lines. They have regarded grammatical form as a surer guide in analysis than, in fact, it is. And they have not known what differences in grammatical form are important.

Men fear thought as they fear nothing else on earth - more than ruin, more even than death.