Now after the birth of the ego, man lives in such a way that he adapts himself to the conditions of the world and of life, and occupies himself within them, in accordance with the principles active through his ego,—the sentient,- the intellectual- and the consciousness-soul. Then there comes a time in which the etheric body retraces the process of its development from the seventh year onward, in reverse order. At first the astral body has so developed itself that it unfolds that which was present within it at birth as a germ. After the birth of the ego, this astral body enriches itself by experiencing the outer world. Finally, at a definite time, it begins to nourish itself spiritually by consuming its own etheric body; it actually lives upon the etheric body. The decay of the physical body in old age is a consequence of this. The course of human life therefore falls into three divisions: a time of unfoldment for the physical and etheric bodies, then one in which the astral body and the ego develop, and lastly that in which the etheric and physical bodies are changed back again. But the astral body plays a part in all the events that take place between birth and death. Since it is really born in a spiritual sense only between the twelfth and sixteenth years and must, during man’s declining years, draw upon the forces of the etheric and physical bodies, that which it is able to perform by its own powers will develop more slowly than if it were not within a physical and an etheric body. After death, when the physical and etheric bodies have fallen away, evolution, during the time of purification, proceeds in such a manner that it occupies about one-third of the duration of life between birth and death. The Higher Regions Of The Spiritual World