The psychoanalytic study of aggression has not been proportionally to its utmost relevance. Freud saw it as destruction, his vision being contested in this paper. In the beginning (1915) he described aggression as a participant of the sexual and ego instincts, helping both functions. Few years later (1920), he said it is a deflection of the instinct of death outwards as destruction. Lorenz, the ethologist, describes it as an instinct, in a different sense of the Germanic word Trieb, which Strachey translated for instinct in the Standard Edition of the Complete Psychological Works of Freud. Contrary to Freud's conception, it could be a component of the instinct of life, similarly as nutrition and sexuality. Sexuality is the only one among the three that is entirely repressible; aggression is subject to repression when it expresses hate — in view of its essentiality to vital functions, it cannot be repressed indefinitely. The belief that aggression is suppressible has a strong effect on education— a little aggressive child is considered well-educated. Being it irrepressible, the yearning to suppress aggression may transform it into destructiveness, as the sexual instinct may degenerate into perversion. In short, the way the aggressive instinct manifests itself throughout life may be equated with the instinct of life, which expresses itself through aggression. So, the suppression of aggression should affect life. A way of dealing with aggressive instinct is to find why it is converted into destructive impulse. This seems to be the effect of disturbances in the formation of the superego, when the subjective object is transformed into a real one and the primary narcissism, into a secondary one.