De Clave Kabbalistica Huius Artis
Now then to thee who art long since Master of High Magick, it will be easy to shew how the Mass of the Holy Ghost, sung even in Ignorance, may work many a Wonder by Virtue of the Force generated being compelled to manifest on other than its own Plane. Here then is a Theory of the Mystery of the Aeon, that I, being the Logos appointed thereunto, did create an Image of my little Universe in the Mind of the Woman of Scarlet; that is, I manifested my whole Magical Self in her Mind. Thus then in Her, as in a Mirror, have I been able to interpret myself to myself. Thou also in thine own Way hast the Power to create such an Image; but be thou sure and alert, testing constantly the Persons in that Image by the Holy Qabalah and by the true Signs of Brotherhood. For each Person therein shall be a Part of thyself, made individual and perfect, able to instruct thee in thy Path. Yet often there shall be others, that are to aid thee in thy Working, or to oppose it. And in this Matter thou shalt read especially the Record of thy Father His Workings with Soror Ahitha (blessed be Her Name unto the Ages) and certain others to Boot.
 On the Qabalistic Key of this Art