Psychology of Man’s Possible Evolution (Unabridged‪)‬

Continuing our study of man, we must now speak with more detail about the different states of consciousness.

As I have already said, there are four states of consciousness possible for man: Sleep, waking consciousness, self-consciousness, and objective consciousness; but he lives only in two: Partly in sleep and partly in what is called waking consciousness. It is as though he had a four-storied house, but lived only in the two lower stories.