VIII. Insanity in the Light of Spiritual Science

We distinguish in human beings the following physical components that correspond to their higher, that is, their above members: first the purely physical, what is built according to purely physical laws, especially the sense organs. What builds a crystal could also build the human body, though it would be an organism without life. Second, we have everything connected with digestion, growth and propagation built by the ether body; third, the nervous system (brain and spinal cord) built by the astral body; fourth, the blood circulation, of which the "I," living in the blood, is the architect. Thus, we have: