Today, man has a physical body, an etheric body, an astral body, and an ego. When the ego works upon the astral body, ennobling it intellectually, morally, and spiritually, then the astral body becomes the spirit self or manas. That has as of now hardly begun, but when in the future it will have been completed, when man will have transformed his whole astral body, then will his astral body become physically luminous. Just as the seed holds the whole plant within it, so does your astral body hold within it the seed of light. This will stream out into the world of space, its development and continuing formation effected by man as he ever more purifies and ennobles his astral body. Our earth will transform itself into other planets. Today it is dark. Were one to observe it from space, then one would see that it appears bright only through the reflected light of the sun. Someday, however, it will be luminous, luminous through the fact that human beings will then have transformed their whole astral bodies. The totality of astral bodies will stream out as light into world space, as it was also at the time of the old Sun. It had higher beings at their human stage, and these beings had luminous astral bodies. The Bible, quite correctly, calls these beings, Spirits of Light or Elohim.