The division of the psychical into what is conscious and what is unconscious is the fundamental premise of psycho-analysis; and it alone makes it possible for psycho-analysis to understand the pathological processes in mental life, which are as common as they are important, and to find a place for them in the framework of science.

I cannot face with comfort the idea of life without work; work and the free play of the imagination are for me the same thing, I take no pleasure in anything else.

Perception is less of a recording system and more of a protection system against external stimuli.

Dogs love their friends and bite their enemies, quite unlike people, who are incapable of pure love and always have to mix love and hate.

It is impossible to overlook the extent to which civilization is built upon a renunciation of instinct.

Maturity is the ability to postpone gratification.

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