[Sidenote: Brain Development]
A particular brain center, of course, will be strengthened both by the
_food_ of sense impressions it is given, and by the _exercise_ of
handling messages to and from the mind. The brain, or physical
instrument of the mind, is like an intermediary or go-between of the ego
and the body. It is of the utmost importance that it should do its work
efficiently. Otherwise the full capability of neither the outer nor the
inner man can be utilized.
If Brown passes something to Jones, who passes it along to Smith; then
Smith passes it back to Jones to be re-passed to Brown--Jones, the
middle agent of transmission or handling instrument, whom we are
comparing to the brain, might be so awkward, slow, and inefficient as a
go-between that the possible ability of Brown and Smith in passing would
be nullified or greatly hampered. But if the inefficiency of Jones is
blamable to his inexperience, it evidently can be changed to efficiency
by _sufficient right exercise_ in passing.
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