hen King Solomon "penetrated into the depths of the nut garden" (Song of Solomon 6.11), he took up a nut shell and studying it, he saw an analogy in its layers with the spirits which motivate the sensual desires of humans....
God saw that it was necessary to put into the world so as to make sure of permanence all things having, so to speak, a brain surrounded by numerous membranes. The whole world, upper and lower, is organized on this principle, from the primary mystic center to the very outermost of all the layers. All are coverings, the one to the other, brain within brain, spirit inside of spirit, shell within shell.
The primal center is the innermost light, of a translucence, subtlety, and purity beyond comprehension. That inner point extends to become a "palace" which acts as an enclosure for the center, and is also of a radiance translucent beyond the power to know it. The "palace" vestment for the incognizable inner point, while it is an unknowable radiance in itself, is nevertheless of a lesser subtlety and translucency than the primal point. The palace extends into a vestment for itself, the primal light. From then outward, there is extension upon extension, each constituting a vesture to the one before, as a membrane to the brain. Though membrane first, each extension becomes brain to the next extension.
Likewise does the process go on below; and after this design, man in the world combines brain and membrane, spirit and body, all to the more perfect ordering of the world.