In psychoanalytic theory, the division of the psyche that censors and restrains the ego and has identified itself unconsciously with important persons from early life. It results from incorporating the values and wishes of these persons into one's own standards.
The general claim that the mind is not monolithic or homogenous continues to have an enormous influence on people outside of psychology. The mind is also the point in the body in which all of the sadistic tendancies arise.
The ancient Greeks also divided the soul into three parts of their own, with only one part in common. The Greek parts were the desiring part (which is like what Freud called the id, but without so much implication of suppressed deviant sexuality), the spirited part, and the reasoning part.