Plurality of inhabited worlds
Intelligent life would not be limited to Earth, and worlds would serve different evolutionary stages.
What it is: The plurality of inhabited worlds holds that other worlds of the universe can be dwelling places of intelligent beings.
How the tradition understands it: These worlds would participate in the divine plan and could correspond to different degrees of moral and material development.
Textual basis and context: The doctrine appears in The Spirits' Book and has gained prominence in modern Spiritist readings on cosmos and progress.
Debates and variations: The belief precedes contemporary astronomy in its Spiritist form and is therefore usually treated more as a cosmological-religious principle than as a verifiable scientific claim in its details.
Supportive
Spiritist Review on inhabited worlds
Periodical texts expand reflections on the plurality of worlds.
Reference: Spiritist Review, articles on the plurality of worlds.
Content: Kardec and collaborators expand the doctrine to reflect on progress, planets, and diversity of conditions of existence.
Use in debate: It complements The Spirits’ Book in Spiritist cosmology.
The Spirits’ Book, questions 55-58
Questions about the plurality of inhabited worlds.
Reference: The Spirits’ Book, questions 55 to 58.
Content: The text maintains that all globes moving in space are inhabited and participate in providential purposes.
Use in debate: It is the main Kardecist reference for the plurality of inhabited worlds.