His most enduring claim to fame is the crucial role he played in the transformation of spiritualism, a medium's passive reception of messages from the spirits of the dead, into occultism, the active search for personal spiritual realization and inner vision.

Reprint of the original, first published in 1872. The publishing house Anatiposi publishes historical books as reprints. Due to their age, these books may have missing pages or inferior quality. Our aim is to preserve these books and make them available to the public so that they do not get lost.