This document discusses the nature of the learner by examining the soul, mind, body, nervous system, muscles, and endocrine glands. It states that the human individual is composed of both soul and body, and that the soul and body exist in mutual dependence. It describes the soul as the principle of life and mental activity, and the mind as the source of conscious thought. It then explains the organization and functions of the nervous system, muscles, and endocrine glands that comprise the body and their relationship to mental processes.