It is not by delusion, however exalted, that mankind can prosper, but only by unswerving courage in the pursuit of truth.

Marriage is for women the commonest mode of livelihood, and the total amount of undesired sex endured by women is probably greater in marriage than in prostitution.

Human nature being what it is, people will insist upon getting some pleasure out of life.

If a man is offered a fact which goes against his instincts, he will scrutinize it closely, and unless the evidence is overwhelming, he will refuse to believe it. If, on the other hand, he is offered something which affords a reason for acting in accordance to his instincts, he will accept it even on the slightest evidence. The origin of myths is explained in this way.

Only six need be attempted.

Some people would rather die than think.

Calculating machines do sums better than even the cleverest people… As arithmetic has grown easier, it has come to be less respected.