Esoteric Lesson

Now we also know that the physical expression of the ego is the blood, the physical expression of the astral body is the nervous system, and the physical expression of the etheric body is the glandular system. Human development proceeds in such a way that, starting from the ego, the astral body and etheric body are first transformed into manas (spiritual self), then into the life spirit and finally into the spiritual human being. The “children of the ego,” as the lower bodies are called in occultism, must therefore be gradually taken hold of by the ego, as if permeated by fire.