Part One: Concepts
The Three Aspects and their relation to the Trinity are presented. This leads to a series of important subjective concepts. Each of these concepts then consist of a number of individual subjects which the reader must approach with an open mind. In the course of time the reader will apprehend just how these various topics actually relate, and this tendency in itself mirrors the nature of the evolutionary process. Some of the more basic are:
Everything we see in the universe is part of the Deva (Angelic) Evolution which is the third Aspect in total, the Mother. 
Similarly, everything having to do with man, animal or plant is entirely non-material from a life and consciousness point, and these belong to the second Aspect, the Son. In this context, we humans as well as the lives of other kingdoms must utilize a form or vehicle supplied by the deva evolution to exist objectively. The form that we see incorporates the needed physical sensory apparatus necessary for the particular evolutionary level of that existence. So, what we are is expressed through the form we occupy, and we in turn identify with that form.
The evolutionary process is actually dual in nature. The life and consciousness that we are is slowly developing or evolving lifetime by lifetime, incarnation by incarnation. The form we utilize must also be developing and evolving, and that developing form nature is under control of what might be termed the universal mind up to a point.
The physical states of matter we know are discussed, and this will bring to the reader the initial realization as to how the subjective worlds are structured. The subject of the four ethers is then launched, and applied to the greater scheme through analogy. This approach utilizes the occasional points of corroboration that appear throughout the Bailey books. An understanding of these concepts is necessary to understanding the structure of the objective and subjective worlds.
The concept of energy as expressed through the seven rays is approached. This is an energy form presently unknown to science. Ray energies are known to man only through their effects, and it is the impact of ray energy upon the matter aspect that gives rise to the living, vibrant world we experience.
These seven forms of energy in the universe are the basis of all manifestation because they represent the Father Aspect. The animal kingdom utilizes five of these in its form nature, and involves a group soul. The nervous system of animal man is structured in this manner. In the human kingdom, man has a constitution that utilizes all seven rays, and man now has an individual soul. This is what forever separates him from the animal kingdom.