

Crowley says that the author was an entity named Aiwass, whom he later referred to as his personal Holy Guardian Angel. The book contains three chapters, each of which was alleged to be written down in one hour, beginning at noon, on 8 April, 9 April, and 10 April in Cairo, Egypt, in the year 1904. The primary precept of this new aeon is the charge, " Do what thou wilt shall be the whole of the Law." Through the reception of the Book, Crowley proclaimed the arrival of a new stage in the spiritual evolution of humanity, to be known as the " Æon of Horus".

The three chapters of the book are spoken by the deities Nuit, Hadit, and Ra-Hoor-Khuit. Rose Edith Kelly, Crowley's wife, wrote two phrases in the manuscript. Aleister Crowley said that it was dictated to him by a beyond-human being who called himself ' Aiwass'. Despite this strong gender duality, the Priestesses asserted that their role was personally and spiritually empowering, and they maintained that heterosexual and polarized gendered roles are necessary in a transformative ritual which ultimately reveals the godlike unified individual.Liber AL vel Legis ( Classical Latin: ), commonly known as The Book of the Law, is the central sacred text of Thelema. Findings suggest that the Priestess’ role in the Gnostic Mass is associated with channeling, receptivity, womb, cup, and fertility, while the Priest’s role is associated with enthusiasm, activity, phallus, lance, and virility. The apparent contradiction between the empowered individual and the polarized gender role was examined by comparing the ritual symbolism of the feminine with the interpretations of four Priestesses and three Priests (three pairs plus one). The Gnostic Mass of the Ecclesia Gnostica Catholica (E.G.C.) suggests a heterosexual gender binary in which the female Priestess seated on the altar as the sexual and fertile image of the divine feminine is directed by the male Priest’s activity, desire and speech.
