In fact it was in Egypt, in March of 1904, that Crowley had the most important experience of his life. Crowley had been trying for several years to contact his Holy Guardian Angel using the methods described in The Book of the Sacred Magic of Abramelin the Mage with no success. However it was in Cairo that Crowley finally encountered an entity known as Aiwass, whom Crowley believed was his Holy Guardian Angel.

  According to Crowley's own account, while (unsuccessfully) trying to summon sylphs for his wife's amusement, she began to receive a very powerful psychic message from the Ancient Egyptian god Horus.

  Skeptical of his wife's sudden clairvoyancy, Crowley demanded answers to a series of questions from her, of which she had no possible prior knowledge. Upon answering all things correctly, he took her to a museum, and after passing several images of Horus (which the still skeptical Crowley reports, he "noted with silent glee"), she pointed across the room to a stele which could not be clearly seen from where they stood. When they examined the stele (now referred to as the Stele of Revealing, it was painted with the image of Horus, and to Crowley's further conviction, it was labelled as item number 666 in the museum catalog.

  Crowley had himself adopted 666 as his personal moniker in rebellion to his religious upbringing many years before. After invoking Horus, Crowley made his fateful breakthrough. For three days Crowley took dictation from the entity identifying itself as Aiwass, the resulting text, Liber AL vel Legis, became what is now known as The Book of the Law.

  This book was to become the central core of Crowley's philosophy. Crowley was named the Prophet of a New Aeon which would end the Age of Osiris and usher in the Age of Horus, a signal that a new era had begun for mankind, and that the old religions were to be swept aside.

Reference:  www.popsubculture.com, Aleister Crowley biography.

 

Comment:  Note the similarity to Gerald Flurry:  A man receives revelation from an angel, writes it in a book, and becomes a prophet.  There are many other examples of this satanic trick (e.g. Joseph Smith being visited by the angel Gabriel, then writing the Book of Mormon and becoming a prophet).