The Holy Books of Thelema.

As Crowley developed the religion he wrote widely on the topic, producing what are collectively termed the Holy Books of Thelema.

--- Let the Philosophus read solely in his copies of the holy books of Thelema, during the whole period of his devotion.

Thelemites who work on their own or in an independent group try to achieve this ascent or the purpose thereof using the Holy Books of Thelema and/or Crowley's more secular works as a guide, along with their own intuition.

Smith also created a set of irregularly-shaped Tarot cards, one of which was adapted for the color Ordo Templi Orientis degree certificates, and used with several others for the paperback Holy Books of Thelema which Smith designed.

Liber CCXX: Liber AL vel Legis sub Figura CCXX: The Book of the Law-Among the Holy Books of Thelema, the chief is The Book of the Law.