Along with Aleister Crowley, Madame Blavatsky, and George Gurdjieff, P. D. Ouspensky (1878 –1947) was one of the most important and influential figures in the occult movements of the twentieth century. With such books as The Fourth Dimension (incorporated in this present volume), Tertium Organum, In Search of the Miraculous, and The Psychology of Man's Possible Evolution, he earned a loyal following among those seeking a deeper knowledge of themselves and their lives, and of the...