I. Soul and Spirit in the Human Physical Constitution

It is obvious from this that an understanding of our connection with the surrounding universe is possible only as the result of thorough study of these members of being, of which ordinary, mechanistic thinking takes no account at all. But everything in us interpenetrates, and because the Ego is in the warmth organism it also permeates the air organism, the fluid organism, and the solid organism; it permeates them with the warmth which is all-pervading. Thus the warmth organism lives within the air organism; the warmth organism, permeated as it is with the forces of the Ego, also works in the fluid organism.