Five volumes have been written under the overall title of A Treatise on the Seven Rays, based on the fact, the nature, the quality and the interrelationship of the seven streams of energy pervading our solar system, our planet and all that lives and moves within its orbit. Volumes I and II go extensively into the psychological make-up of a human being as the life, quality and appearance of an incarnating, evolving spiritual entity. They also relate the circumstance of a human psychology to world conditions and to future possibilities.