It is well known that Aleister Crowley formally started his occult journey, during that particular Incarnation, in the now defunct Hermetic Order of the Golden Dawn. Rising quickly through the Grades of the Outer College, Frater Perdurabo did become an Adept and perform an Operation of the Sacred Magic of Abramelin the Mage.
The result of this Operation was the reception of the Book of the Law and the modern founding of the A∴A∴ as detailed in The Temple of Solomon the King (The Equinox, Vol. I) and Liber LXI.
It is from the A∴A∴ that the Law originates.
In addition to becoming the Magus of the new Aeon of Force of Fire with Ra-Hoor-Khuit enthroned upon Ra's seat, our beloved Magus instructed Frater V.V.V.V.V. to create a new language with Frater O.M. to translate the Energy of the Supernal Triad into the gesta of the dependent Triads within the Hierarchy of A∴A∴
By this fusion of Arcane Art and Science, the disciplined Aspirant may attain to the completion of the Great Work upon every Plane and Grade.
The Oath and Task, fulfilled to the letter, provide sufficient working parameters for all those attempting the sublime Magick of Initiation as scientifically possible along each step of the Path.
Yoga and Magick (Book IV, Part I), Magick and Mysticism (Book IV, Part II), and Magick Commented (Book IV, Part III) provide the technical details of the training and techniques needed to conquer each Step along the Path of Initiation.