Die heiligen Bücher von Thelema

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Aleister Crowley, the founder of Thelema, designated his works as belonging to one of several classes. Not all of his work was placed in a class by him.
Class A consists of works that are not to be changed, even to the letter. The Holy Books fall in this category.
Class B consists of works of scholarship and enlightenment.
Class C consists of material that suggests things other than the obvious.
Class D consists of official rituals and instructions.
Class E consists of manifestos, broadsides, epistles and other public statements.