A state of consciousness is characteristically very transitory; an idea that is conscious now is no longer so a moment later, although it can become so again under certain conditions that are easily brought about.

Tobacco is the only excuse for Columbus's misadventure in discovering America.

The psychical, whatever its nature may be, is itself unconscious.

Religion is an attempt to get control over the sensory world, in which we are placed, by means of the wish-world which we have developed inside us as a result of biological and psychological necessites.

To endure life remains, when all is said, the first duty of all living being Illusion can have no value if it makes this more difficult for us.

The creative writer does the same as the child at play; he creates a world of fantasy which he takes very seriously.

The inclination to aggression constitutes the greatest impediment to civilization.