The American people, taking one with another, constitute the most timorous, snivelling, poltroonish, ignominious mob of serfs and goosesteppers ever gathered under one flag in Christendom since the end of the Middle Ages.

There are no dull subjects. There are only dull writers.

The scientist who yields anything to theology, however slight, is yielding to ignorance and false pretenses, and as certainly as if he granted that a horse-hair put into a bottle of water will turn into a snake.

If the American people really tire of democracy and want to make a trial of Fascism, I shall be the last person to object. But if that is their mood, then they had better proceed toward their aim by changing the Constitution and not by forgetting it.

Absence is the dark-room in which lovers develop negatives.

The notion that science does not concern itself with first causes - that it leaves the field to theology or metaphysics, and confines itself to mere effects - this notion has no support in the plain facts. If it could, science would explain the origin of life on earth at once - and there is every reason to believe that it will do so on some not too remote tomorrow. To argue that gaps in knowledge which will confront the seeker must be filled, not by patient inquiry, but by intuition or revelation, is simply to give ignorance a gratuitous and preposterous dignity.

Religion is "so absurd that it comes close to imbecility."