In this classic work on magick, Aleister Crowley lays out the foundation upon which all further magical work is based. First published in 1913, the book is widely considered to be without equal in occult literature due to its simplicity, clarity, and depth. In his foreword to this Weiser Books edition, first published in 1980, the famed occultist and ceremonial magician Israel Regardie (1907-1985) writes that "a throughgoing comprehension...