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Only a very small percentage of these cults which feature the study of Truth and the life of its quest, ever actually realize the pure truth or stay on the right path. Most are wandering astray, with leaders and led losing themselves in a mixture of truth and error, and functioning on a level of fantasy and opinion, illumined with shafts of inspiration and revelation. Quite a number are unconsciously tinted with hidden black magic and harmful evil. No man can arrive at the quest's goal through their agency; he must leave them first.
-- Notebooks Category 16: The Sensitives > Chapter 10 : The Is Is Not an Ism > # 3