Exact Clairvoyance and Ideal Magic
This also enables us to understand something very important: We can now understand how a supersensible etheric world (we shall speak of other supersensible worlds in due course) can be retained. It is a supersensible, etheric world which comprises our own being, the course of our own life and the etheric part of Nature which reaches as far as the starry spheres. We learn to know this etheric world. And we learn to experience our own being within this etheric world, and at the same time we learn to know that unless we come down into the physical body it is impossible to retain the etheric world longer than two or three days at the most. If our clairvoyant faculties are highly developed, the etheric world can be retained for two or three days.