5. The starting-point of the universal fluid is the degree of absolute ethereality, of which nothing can give us an idea. Its opposite point is its transformation into material substance. Between these two extremes there exist innumerable transformations, which are allied more or less to one another. The fluids which are the nearest materiality – consequently the least pure – are composed of that which might be called the spiritual terrestrial atmosphere. In this midst are found the widely different degrees of ethereality whence the incarnated and discarnated inhabitants of the Earth draw the necessary elements for the economy of their existence. These fluids, however subtle and impalpable they may be to us, are nevertheless of comparatively gross nature to the ethereal fluids of the superior regions.
It is the same on the surface of all worlds, saving the differences of constitution and vitality proper to each. The less material life there is there, the less the spiritual fluids have of affinity with matter.
The name “spiritual fluid” is not rigidly accurate as it is really always matter more or less refined. There is nothing really spiritual, but the soul or intelligent principle. We designate fluids thus by comparison, and chiefly by reason of their affinity with spirits. They constitute the substance of the spiritual world. That is why they are called spiritual fluids.