Measures of sterilization should, in my opinion, be very definitely confined to persons who are mentally defective

If the ordinary wage-earner worked four hours a day, there would be enough for everybody, and no unemployment — assuming a certain very moderate amount of sensible organization. This idea shocks the well-to-do, because they are convinced that the poor would not know how to use so much leisure.

A world full of happiness is not beyond human power to create; the obstacles imposed by inanimate nature are not insuperable. The real obstacles lie in the heart of man, and the cure for these is a firm hope, informed and fortified by thought.

I do not think that the real reason why people accept religion has anything to do with argumentation. They accept religion on emotional grounds.

One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision.

If everything has a cause, then God must have a cause. If there can be anything without a cause, it may just be the world as God.

But it is just this characteristic of simplicity in the laws of nature hitherto discovered which it would be fallacious to generalize, for it is obvious that simplicity has been a part cause of their discovery, and can, therefore, give no ground for the supposition that other undiscovered laws are equally simple.