In The Temple of Solomon The King Aleister Crowley recalls details of the writing of Liber AL:
“The three days were precisely similar, save that on the last day I became nervous lest I should fail to hear the Voice of Aiwass. They may then be described together.
I went into the “temple” a minute early, so as to shut the door and sit down on the stroke of Noon.
On my table were my pen–a Swan Fountain–and supplies of Quarto typewriting paper, 8″ x I0″.
I never looked round in the room at any time.
The Voice of Aiwass came apparently from over my left shoulder, from the furthest corner of the room. It seemed to echo itself in my physical heart in a very strange manner, hard to describe. I have noticed a similar phenomenon when I have been waiting for a message fraught with great hope or dread. The voice was passionately poured, as if Aiwass were alert about the time- limit. I wrote 65 pages of this present essay (at about my usual rate of composition) in about 10 1/2 hours as against the 3 hours of the 65 pages of the Book of the Law. I was pushed hard to keep the pace; the MS. shows it clearly enough.
The voice was of deep timbre, musical and expressive, its tones solemn, voluptuous, tender, fierce or aught else as suited the moods of the message. Not bass –perhaps a rich tenor or baritone.
The English was free of either native or foreign accent, perfectly pure of local or caste mannerisma, thus startling and even uncanny at first hearing.
I had a strong impression that the speaker was actually in the corner where he seemed to be, in a body of “fine matter,” transparent as a veil of gauze, or a cloud of incense-smoke. He seemed to be a tall, dark man in his thirties, well-knit, active and strong, with the face of a savage king, and eyes veiled lest their gaze should destroy what they saw. The dress was not Arab; it suggested Assyria or Persia, but very vaguely. I took little note of it, for to me at that time Aiwass and an “angel” such as I had often seen in visions, a being purely astral.
I now incline to believe that Aiwass is not only the God or Demon or Devil once held holy in Sumer, and mine own Guardian Angel, but also a man as I am, insofar as He uses a human body to make His magical link with Mankind, whom He loves, and that He is thus an Ipsissimus, the Head of the A∴A∴ Even I can do, in a much feebler way, this Work of being a God and a Beast, &c., &c., all at the same time, with equal fullness of life.
You’ll find the holograph of the Third Chapter here: http://lib.oto-usa.org/libri/liber0220.html#chap3
You’ll find a tool bar to the left of the page and by clicking “Next Page” you can flip through the entire chapter.