28. In their essence, dreams present all three characteristics of the visions described above. Prophetic dreams, presentments and warnings belong to the first two categories. * Under the third category, that is, in the fluidic creations of thought, we can find the causes for certain fantastic images, which have nothing real for the corporeal life, but that has, for the spirit, such a clear reality that the body suffers the blows (upon being hit), and one’s hair turn white under the impression of a dream. Such creations can be provoked by an exaggerated credulity, retrospective recollections, or by likes, desires, passions, fear, and remorse; it can also be caused by habitual worries, or because of the body’s needs, or still by a malfunction of the organism; finally, it can also be caused by other spirits with good or bad intentions, according to their nature. **
* See ahead, chapter XVI on Theory of Prescience, n° 1, 2 & 3.
** “Revue Spirite,” June of 1866, pg. 172; September of 1866, pg. 284; “The Spirit’s Book,” chapter VIII, question n° 400.