Crowley began writing the Liber Al vel Legis – literally, “The Book of the Law” in 1904 and wrote one chapter for three days, finishing the book on the tenth. Crowley claimed that the book was dictated to him by an angelic entity named Aiwass.
For the rest of his life, Crowley insisted that Aiwass was a separate entity from himself, claiming that the spirit was his Holy Guardian Angel. Others have suggested that Aiwass was in fact a part of Crowley’s own mind, citing the stylistic similarities between this book and his other works.
Crowley published the book later in 1904, and the world was treated to his proclamation of the new Aeon of Horus. The book has never been out of print for more than a century now, which is surely evidence of some magickal power on Crowley’s part.