Fourth Way and Ouspensky-adjacent modern mystical philosophy: cognition, self-development, higher consciousness, and the occult mind after disenchantment.
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Tertium Organum — P.D. Ouspensky — P.D. Ouspensky's third canon of thought — a landmark work of esoteric philosophy exploring the fourth dimension, higher consciousness, and the mathematics of the infinite, bridging Kantian metaphysics with mystical experience.