The Spirits' Book
Book Two - The Spirit World
Chapter VII - Return to Physical Life
Moral and Intellectual Faculties
366. What about the theory that persons of various intellectual and moral faculties are the product of multiple spirits each possessing a special aptitude incarnated within him or her?
“A moment’s reflection will show the absurdity of this theory. Each spirit is destined to possess all possible aptitudes, but it must have one individual will to progress. If a human being was a combination of different spirits, this single will would not exist and this person would possess no individuality. Upon this person’s death, all the spirits would fly off in separate directions like birds escaping from a cage. Human beings often complain that they do not understand certain concepts, yet they are experts at unnecessarily complicating them, even when they have the most simple and natural explanation close at hand. This is yet another instance of how humans often mistake the effect for the cause. This theory is quite similar to what the pagans believed of God, except in this case it applies to humanity. They believed in the existence of a god for every phenomenon in the universe, but more rational among them see these phenomena as a variety of effects with one God as their cause.”
The physical and moral worlds offer us numerous points of comparison in this matter. While humankind remained focused on the appearance of natural phenomena, they believed in the existence of many different kinds of matter. Today, all these phenomena are seen as being modifications of a single elementary substance. The various faculties are manifestations of the same, unique cause, which is the soul or incarnate spirit, and not multiple souls, just as the different sounds of an organ are the product of the same air and not different types of air for each sound.
According to this theory, when an individual gains or loses abilities or preferences, these changes are the result of a corresponding number of spirits who enter or vacate his or her body. This would transform human beings into compound beings without any individuality, and, consequently, without any accountability. This theory is disproved by the many spirit manifestations that conclusively demonstrate their personality and identity.