Demons do not exist any more than gods do, being only the products of the psychic activity of man.

Desire presses ever forward unsubdued.

There is a psychological technique which makes it possible to interpret dreams, and ... if that procedure is employed, every dream reveals itself as a psychical structure which has a meaning and which can be inserted at an assignable point in the mental activities of waking life.

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.

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.

Dreams are constructed from the residue of yesterday.

Religion belonged to the infancy of humanity. Now that humanity had come of age, it should be left behind.