Mind is defined as the meaning of behavior. As such we are compelled to assume it exists from the moment of conception, since growth exists from that time and, presumably, thought in the form of instant organization to the response of growth exists from that time. Shortly before birth true behavior begins and is organized according to the pleasure-pain principle. After birth, sensory perception begins and stimulates the brain to ideation, which enables the subject to organize his behavior to the world beyond his own body. Object relationship develops, and through it the world of feeling becomes related to the world of sense perception. According to the author this conception avoids the mind-body antithesis and invalidates the instinct theory of psychoanalysis.