In a few weeks he will use
the old language naturally; whereas another man, who never had spoken
it, would require years to build up such full knowledge from a start of
complete ignorance of the language.
Evidently, too, a _weak_, undeveloped brain center would be incapable of
receiving _strong_ mental impulses from its coordinated mind center, and
of transmitting them in full strength to the particular muscles governed
by that mind center. This is why, if a man's _brain center_ of courage
is undeveloped, even the most courageous _thoughts_ will not make his
body _act_ bravely. His legs may run away against his will to fight. The
physical instrument of his mind (his brain), and also certain associated
sets of muscles, must be sufficiently exercised in the _action_ of
courage to build up within him the _physical structure_ of fearlessness
that will be instantly responsive to a _mental attitude_ of bravery.
[Sidenote: Right Exercise for Development]
If for any reason the brain instrument is weak or undeveloped, it can
handle only weakly either in-coming messages to the ego from the senses,
or out-going impulses from the mind to the muscles.
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