It is an established and accepted occult fact that the soul works through the mechanism of the three-fold personality in stimulating the three worlds of human evolution—the mental, the emotional and etheric/physical planes of consciousness.

In this book the method by which the soul and the personality vehicles interact and function together is clearly presented. The author also reveals the relationship between what the occultist accepts in the constitution of man as the vital body, the etheric network with its energy vortices, or centres, and the physiological effects on the body through glandular secretions directly into the bloodstream. This is the endocrine system of glands, which correspond in the physical body to the energy centres in the etheric body and which, therefore, react to the type and potency of force the etheric body circulates at any one time.

Human behaviour, and the disposition of the physical body, are conditioned by the extent to which the personality vehicles either receive or reject the impulses of the soul; and this is conditioned by the emphasis or focus of consciousness at any one time. The physical vehicle is not a principle; it responds to any dominant force expressing itself through the etheric system of energy centres.