9. The nature of the fluidic envelope is always in accord with the degree of moral advancement of the spirit. Inferior spirits cannot change their inclination, and consequently cannot by desire transport themselves from one world to another. It is they whose fluidic envelope, although ethereal and imponderable as regards tangible matter, is still too heavy, if one can express it thus, in relation to the spiritual world to allow them to leave their place. It is necessary to include in this category those whose perispirit is gross enough to be confounded with their carnal body, which for this reason they believe is still alive. These spirits (and their number is great) remain on the surface of the Earth like the incarnated ones, believing themselves always to be attending to their occupations. Others, a little more dematerialized, are not sufficiently so to elevate themselves above the terrestrial regions. *
Superior spirits, on the contrary, can enter into inferior worlds, and even incarnate themselves there. They draw, from the constitutive elements of the world they enter, the materials for the fluidic and carnal envelopes appropriate to the midst where they find themselves. They, like the great lord who temporarily leaves his gilded garments to assume the peasant’s garb, without being other than the titled character he is on account of the change, will not change thereby their high estate.
It is thus that spirits of the most elevated order can manifest themselves to the inhabitants of Earth, or incarnate themselves for a mission among them. These spirits carry with them, not the envelope, but the remembrance by intuition of the regions whence they came, and which they see in thought. These are people who see among the blind people.
* Examples of spirits believing themselves still in this world: “Revue Spirite,” Dec., 1859, p. 310; Nov., 1864, p. 339; April, 1865, p. 117.