Team-work Processes
You understand now that your growth should be on a dual basis; that you have two different men to develop, not just one; and that they must be handled discriminatively, but together.
Next it is necessary that you know in exactly what ways the activities of the mind man, or ego, are related to the activities of his body, or the physical man. Otherwise you cannot comprehend the team-work processes by which any desired qualities of manhood can be developed from their rudiments. Perhaps the reason you have not yet succeeded fully is that you have been a "one-horse" man and have not trained your dual self to be an effective mind-and-body team pulling together. It takes both mind and body to bring to market successfully all the "best capability" of a man.
Training Methods
Evidently, as a pre-requisite to self-development, one should have knowledge of the particular processes that result surely in natural, easy, rapid growth. Otherwise he would be more than likely to employ a wrong or only partly right method of training. So as a student of yourself you need to start with comprehension of your two bases of development, mind and body. It is necessary next that you acquire scientific knowledge of the distinct but related processes of developing your two selves severally to work together as a team. Then you must learn the particular methods of coöperative mental and physical training that are most effective in accomplishing the man growth you desire.
Neither Mind Nor Body A Unit
Not only have you two selves, but neither "You" is a single unit. Your mind, as well as your body, is made up of distinctly different but very intimately related and associated parts. Your "mind" cannot be developed as a whole. Its parts must be severally bettered and strengthened in coordination, just as the physical man is developed by training his various muscles.
You know you have distinct sets of muscles which all together make up your composite body. Perhaps, however, you have not realized before that your mind is not a unit, but is made up of innumerable distinct "mind centers," each of which functions as independently of the others as your set of eye muscles operates independently of the set of muscles governing the movements of one of your fingers. And possibly you do not know that each mind center has a distinct brain center, which functions for that particular part alone of your whole mind. Each associated mind-and-brain center also has direct, distinct nerve connections with only one set of muscles.
In fact, you are "a many-minded, many-bodied" man—a collection of mental and physical parts, a composite man rather than a man unit. These several parts are in large measure practically independent of one another. One set of body parts "belongs to" only its particular associated set of mind parts, or mind center.
Independent Mind and Body Centers