The conversation between Anna Sprengel and Aiwass about Aleister Crowley's belief and teaching of magical memory draws heavily from Crowley's Magick (Book 4), more specifically its third part, "Magick in Theory and Practice". In its seven chapter, "The Formula of the Holy Graal.: of Abrahadabra: and of certain other Words Also: the Magical Memory", Crowley expounds on how Magical Memory works and why it's important for the practitioner of magick.[3][4][5]
↑Crowley, Aleister. (written 1912–13). Liber ABA (Magick (Book 4), Magick in Theory and Practice (Part III), Chapter 7, VI-The Magical Memory, pp.46-52.