All knowledge, we feel, must be built up upon our instinctive beliefs; and if these are rejected, nothing is left.

I think that there is far too much work done in the world, that immense harm is caused by the belief that work is virtuous, and that what needs to be preached in modern industrial countries is quite different from what always has been preached.

Only mathematics and mathematical logic can say as little as the physicist means to say.

Hitler is an outcome of Rousseau.

Ethics is in origin the art of recommending to others the sacrifices required for cooperation with oneself.

Who ever heard a theologian preface his creed, or a politician conclude his speech with an estimate of the probable error of his opinion?

There is no nonsense so errant that it cannot be made the creed of the vast majority by adequate governmental action.