Lecture III
We will now go more deeply into the various conditions on this our earth. We are surrounded in the first place by the four kingdoms of nature; the mineral, vegetable, animal, and human kingdoms. Man is not the mere material physical being of which the outer senses inform us, and which the scientific intellect describes and explains but he is a complicated being made up of physical body, etheric body, astral body, and ego. All this we know. When we allow our gaze to sweep over the beings of the other kingdoms of the earth we must be fully aware that the expressions physical body, etheric body, astral body, and ego are by no means meaningless in respect of them also. When dealing with the physical world we have to allow that of all earthly beings man alone possesses an ego-nature; he alone in this physical world has a self-conscious ego. With animals it is quite different; the ego of animals is not in the physical world in the same way man's ego is.