The Ordo Templi Orientis Thelemic Section Study Guides.
An interesting piece if you are looking for Gnostic religion or an insight into the Ordo Templi Orientis.

The book explores the more interesting, controversial and important movements within the modern revival of esoteric study, practice, ethics, sexuality and politics. It is important to stress the diversity of ideas and practices of its adherents.

As to Crowley its founder, much slanderous nonsense and wildly romanticized praise has been unfairly attached to him. Criticizing Crowley's personality and behaviour is much too simplistic for such an intriguing combination of self-proclaimed messiah and avant-garde artist in a variety of mediums. Still, I think that the following quotation by the renowned Chaos Magician Peter Carroll is worth repeating, since Crowley's own journals lend considerable credence to the assessment.

Aleister Crowley founded the organization A.'. A.'. (Argentium Astrum -- the Silver Star) as well as others by members of the OTO (Ordo Templi Orientis -- Order of the Eastern Temple) (founded by Theodor Reuss and Karl Kellner in 1895). These two organizations work together to promote Thelema.
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