Magic: History, Theory and Practice is a mysticism book by Ernst Schertel. Originally published in Germany in 1923, Magic: History / Theory / Practice (in its original German edition), was a hardcover book consisting of 154 pages.Schertel identifies heavily with the "demonic" in Magic, espousing the belief that "communion with the demon" is the most important aspect of magical/religious practice. In 2003 it was revealed that Schertel had sent a dedicated copy of the book to Adolf Hitler.