Lecture XIX
Now, just as the astral body is bound in this way by the system of the spinal cord and all the processes of organic life connected with it, so is the etheric body bound by the cerebral system and everything that belongs to it. Therefore, the etheric body has its point of contact by means of the cerebral system. Similar things could be said here, too. In our head there is a prison for our etheric body. Madness or hypnotic conditions come into operation if the body is not quite well and the etheric body is let loose. Left to itself, i.e., not enclosed in the prison of the head, the etheric body has the tendency to reproduce itself, thus becoming a stranger to itself and spilling over into the world, carrying its life into other things. This is a description of the conditions that come about if the prison warder releases the etheric body.
Cite:
GA 173c/1917-01-14/p023 · edition English