The only unnatural sexual behavior is none at all.

He does not believe that does not live according to his belief.

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

I have no concern with any economic criticisms of the communist system; I cannot inquire into whether the abolition of private property is expedient or advantageous. But I am able to recognize that the psychological premisses on which the system is based are an untenable illusion. In abolishing private property we deprive the human love of aggression of one of its instruments... but we have in no way altered the differences in power and influence which are misused by aggressiveness.

None believes in his own death. In the unconscious everyone is convinced of his own immortality.

The view is often defended that sciences should be built up on clear and sharply defined basal concepts. In actual fact no science, not even the most exact, begins with such definitions. The true beginning of scientific activity consists rather in describing phenomena and then in proceeding to group, classify and correlate them.

Do you not know how uncontrolled and unreliable the average human being is in all that concerns sexual life?