I have a question regarding the following statement on the AD website:

"The astral is the closest dimension to the physical. It overlays and permeates the world like a huge mind net, catching and holding all thought"

What evidence exists that this statement is true? How does Robert know that the astral is the closest dimension to the physical? How does he know it "permeates the world like a huge mind net..." and holds "all thought"? People come up with all sorts of pet theories about all manner of things... I'm just wondering what evidence there is that these statements aren't among them.

Thanks,
Michael