The very emphasis of the commandment: Thou shalt not kill, makes it certain that we are descended from an endlessly long chain of generations of murderers, whose love of murder was in their blood as it is perhaps also in ours.

Religious illusion must bow to scientific truth. It is in total error about the nature of the true world. Only science is not an illusion.

This is one race of people for whom psychoanalysis is of no use whatsoever.

We are what we are because we have been what we have been.

America is the most grandiose experiment the world has seen, but, I am afraid, it is not going to be a success.

We are so constituted that we can gain intense pleasure only from the contrast, and only very little from the condition itself.

Sadism is all right in its place, but it should be directed to proper ends.