Tertium Organum, The Third Canon of Thought: A Key to the Enigmas of the World, A Classic of Theosophy and the OccultThe Tertium Organum by P. D. Ouspensky explains the author's philosophy of human behavior, and attempts to reconcile the natural sciences with the theological and spiritual beliefs developed by mankind. A bold and ambitious work of philosophy, Tertium Organum is a committed attempt to establish a new model of the universe from the perspective of humanity. Our individual reality and perceptions, the application and development of the sciences, and our