The Principles of Spiritist Doctrine
by Allan Kardec, Anna Blackwell (translator)
1900
The book is structured as a collection of questions regarding the origin of the spirits, the purpose of the life, the order of the universe, evil and good and the afterlife. Its answers, according to Kardec, were given to him by a group of spirits who identified themselves as "The Spirit of Truth", whom with he communicated with in several Spiritist sessions during the 1850s. Kardec, who considered himself an "organizer" rather than an author, grouped the questions and their answers by theme, occasionally including lengthier digressions the spirits had dictated to him on specific subjects, some signed by philosophers such as Augustine of Hippo and Thomas of Aquino and writers including Voltaire.