The Spirits' Book (Le Livre des Esprits)

The Spirits' Book (Le Livre des Esprits) presents a structured doctrine its author named Spiritism, set out as several hundred questions and answers said to have been dictated by spirits. Its central claim is that the soul survives death and evolves morally across many successive lives, freely undertaken for the sake of growth.

The method is investigative rather than devotional: communications gathered through several mediums were assembled, cross-examined, and organized into a coherent metaphysical and ethical system. Reincarnation stands at the center, and continuity of consciousness after death is offered as a claim demonstrated through mediumship rather than held on faith alone.

The work sharply diverges from Anglo-American Spiritualism, whose single afterlife of ascending spheres it replaces with a law of successive lives. It founded a tradition that became a major religious and charitable movement, especially in Brazil, and an ancestor of later trance-channeling currents.