Concept of Psychic Energy All human behaviors are energized by psychic energy or psychodynamic forces. This psychic energy is needed to satisfy basic needs. The two kinds of psychic energy are the eros and thatanos. The eros or life instinct is a life sustaining activity that helps the human being to survive such as respiration, eating, drinking and other body activities. Thananos or death instinct is a self destructive activity that is present in all human being. Destructive acts such as killing, injuring oneself or another, fighting, destroying objects, masochism, sadism and all destructive act are outward expression of death instinct.