I. Soul and Spirit in the Human Physical Constitution

It is different when we come to the second, the fluid organism that is permeated by the etheric body. This fluid organism cannot be strictly demarcated from the environment. Whatever is fluid in any area of space adjoins the fluid element in the environment. Although the fluid element as such is present in the world outside us in a rarefied state, we cannot make such a definite demarcation between the fluid element within and the fluid element outside the human organism, as in the case of the solid organism. The boundary between the inner fluid organism and the fluid element in the external world must therefore be left indefinite.