TERTIUM ORGANUM: THE THIRD CANON OF THOUGHT (A KEY TO THE ENIGMAS OF THE WORLD) - Annotated The Pursuit of Inner Wisdom from Plato to Aristotle

Pyotr Demianovich Ouspenskii (known in English as Peter D. Ouspensky, ???? ??????????? ??????????; 5 March 1878 – 2 October 1947), was a mystic who traveled widely in Europe and the East looking for esoteric knowledge. He later studied with G.I. Gurdjieff. In this book, he uses the concept of the fourth dimension as an extended metaphor for the esoteric nature of reality. Einstein and other physicists had at that time validated the study of higher dimensions, and Ouspensky was fixated on this idea. One can only wonder at what he would think of string theory, parallel universes, and the holographic universe hypothesis (the latter of which he prefigures in this book).

This book referred to his believe of the third major philosophical synthesis, the previous being those of Aristotle and Bacon. Originally issued in Russian in 1912, this is the second, revised edition. It was translated into English and published in 1922.