sentences: "Though Parsons was a lifelong devotee to Thelema, he grew weary of and eventually left the Ordo Templi Orientis—the religious organization that began propagating Thelema under Crowley's leadership from the 1910s—which Parsons viewed, despite the disagreement of Crowley himself, as excessively hierarchical and impeding upon the rigorous spiritual and philosophical practice of True Will, describing the O.T.O.as "an excellent training school for adepts, but hardly an appropriate Order for the manifestation of Thelema".