Charles Webster Leadbeater,
The Inner Life: volume I — Fourth Section…
“ People find their own level on the astral plane, much in the same way as objects floating in the ocean do. This does not mean that they cannot rise and fall at will, but that if no special effort is made they come to their level and remain there. Astral matter gravitates towards the centre of the earth just as physical matter does; both obey the same general laws. We may take it that the sixth sub-plane of the astral is partially coincident with the surface of the earth, while the lowest, or seventh, penetrates some distance into the interior. ”
