The final volume of "The Treatise on the Seven Rays" contains the fundamental spiritual structure upon which the next presentation of the teachings of Eternal Wisdom will be based.

The book is divided into two parts. The first part enumerates and examines in detail the Fourteen Rules for Group Initiation. These rules are for students and initiates but at a higher level of spiral evolution, corresponding to the rules for aspirants contained in the book "Initiation, Human and Solar."

The second part deals with the Rays and the Initiations, those nine main expansions of consciousness through which the initiate progressively frees themselves from the various forms of our planetary life as they walk the Path of evolution and service within the universe.