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It is needful to define here what is meant by the word "spiritual." The Hidden Teaching Beyond Yoga points out how ambiguous it has become, how wide a range of connotations it now possesses. To simplify, it can be used generically to cover any or all of the three aspects of human culture which oppose themselves to a materialistic interpretation of life, aspects which may conveniently be named the religious, the mystical, and the philosophic.
-- Notebooks Category 12: Reflections > Chapter 5 : The Literary Work > # 236