This is the third volume in the All and Everything series, consisting of four books. These audiobooks are written according to entirely new principles of logical reasoning and strictly directed toward the solution of the following three cardinal problems. The third volume deals with the assistance of the arising, in the mentation, and in the feelings of the listener, of a veritable, non-fantastic representation not of that illusory world which they now perceive, but of the world existing in reality.

In Tertium Organum Ouspensky questions the assumptions we have about our world. In relation to our cognition of the world and of ourselves the conditions would be ideal if it were possible to accept nothing as data and regard everything as requiring definition and proof. In other words, it would be best to assume that we know nothing, and take this as our starting point.

Since its original publication in 1949, P. D. Ouspensky’s In Search of the Miraculous has been hailed as the most valuable and reliable documentation of G. I. Gurdjieff's thoughts and universal view. This historic and influential work is considered by many to be a primer of mystical thought as expressed through the work, a combination of Eastern philosophies that had for centuries been passed on orally from teacher to student. 

As I wrote in the last chapter of the first series, I had given myself my word that during the whole of this time, I would do no writing whatsoever, but would only—for the well-being of the most deserving of these subordinate parts, slowly and gently—drink down all the bottles of old Calvados now at my disposal by the will of fate in the wine-cellar of the Prieuré, and specially provided the century before last by people who understood the true sense of life.

These lectures were intended by Ouspensky as introductory material for people interested in the work in England. This material is still unmatched as a brief statement of the work's psychological ideas. Designed to be read aloud at weekly meetings of small groups of people interested in the work, they are almost a basic primer of Gurdjieff's psychological ideas on consciousness and spiritual development.