Then
you must learn the particular _methods_ of cooeperative mental and
physical training that are most effective in accomplishing the man
growth you desire.
[Sidenote: 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.
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