15. Let us cite an example: there happens in the world of spirits a very singular occurrence, and one that assuredly no one would have imagined. It is that some spirits think they are still incarnated. However, the superior spirits, who know it well, do not tell us, in response to our anticipation, “There are some spirits who believe that they still live in the Earth- life, who have preserved their tastes, their habits, and their instincts.” We have invoked the manifestation of this category of spirits in order that we may observe them. Having then seen spirits uncertain of their state, or affirming that they were yet of this world, attending to their ordinary occupations, the example has proved the fact. The multiplicity of similar facts has proved that it was not an exception, but one of the phases of spirit-life. We have been permitted to study all the varieties and causes of this singular illusion; have recognized that this situation is characteristic of those but little advanced morally, and that it is peculiar to certain kinds of death; that it is not necessarily of very short duration, but can continue for months and even years. It is thus that theory is born of observation. It is the same of all other principles of the doctrine.