The Book of the Law (Liber Al Vel Legis / Centennial Edition) by Aleister & Rose Edith Crowley

Aleister Crowley (1875-1947) was the most widely read author in 20th-century occultism. He single-handedly redefined magic as a field of inquiry and endeavor through his books and the order that he led--the A.A. and the O.T.O. He is the author several books including The Book of the Law, 777 & Other Qabalistic Writings, and The Book of Thoth.

"Do what thou wilt shall be the whole of the Law."

This oft misunderstood phrase, which forms the basis for Crowley's practice of Magick, is found in The Book of the Law. The Book of the Law is the source book and key for Crowley students and for the occult in general.

The holy text that forms the basis of Crowley's belief system, Thelema, was transmitted to him by the entity known as Aiwass over the course of three fateful April days in Cairo in 1904. With his wife Rose as the medium for what would become known as the Cairo Working, Crowley dutifully transcribed the communications on hotel stationery.