All science seems to pass through three phases: control by the supernatural, then the creation of a system of principles or categories, and finally a relational or dynamic concept. This is as true for the natural sciences as it is for the basic sciences and psychology and psychiatry. This fact is important in the development of man, especially his prehistoric development. Through sexuality man achieves ecstasy and release from the stresses and turmoil of life, and he hopes to conquer death through his sexual activity. The interrelationships of mysticism, religion, and imagery are discussed. Man reflects in his mysticisms perhaps the deepest of dynamic insights about his own behavior. Only now is modern dynamic psychology beginning to give proper recognition to the significance of these facts. 'Man must believe in his gods, in his fellow man and in himself, for without these deepest of all ur-defenses, man, in intolerable anxiety, would indeed perish.'