Crowley always insisted that nobody should try his more advanced techniques without (a) being in excellent health, (b) being competent in at least one athletic skill, (c) being able to conduct experiments accurately in at least one science, (d) having a general knowledge of several sciences, (e) being able to pass an examination in formal logic and (f) being able to pass an examination in the history of philosophy, including Idealism, Materialism, Rationalism, Spiritualism, Comparative Theology, etc. Without that kind of general knowledge and the self-confidence and independence of thought
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