[Sidenote: A Slump in Determination]
In contrast, the man who is only characteristically _determined_, but
who lacks _persistence_ in his determination, has developed just the
habit of hardening his muscles _for the time_ he is determined on doing
a particular thing. That does not exercise his muscles sufficiently to
make them firm _all_ the time, whether under tension or not.
Consequently his determination is likely to slump if his resolution is
subjected to a long strain. He does not possess muscular structure
sufficiently strong to support persistence in his determination.
_Habitual lack_ of firmness in the jaw muscles, as you know, results in
a sagging chin; which detrimentally affects the brain-mind center of
persistence. A man whose jaw habitually hangs loose may be capable of
great _determination_ for a while, but he is not _persistent in
character_. He might clench his teeth, stiffen his body, and plunge into
the surf to rescue a drowning person; but his first resolution to
effect the rescue would be weakened by the cold water and by fear.
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