Let us see how the
discriminative-restrictive principle should be applied specifically to
assure you of building _persistence_ within yourself.
First it is necessary that you discriminate between _this one_ quality
and _all others_; especially between it and the quality of
_determination_. Very _different_ training methods are required to
develop persistence and determination respectively. When you are just
"determined" to do a thing, your jaw muscles, your arm and back muscles,
perhaps all your commonly known muscles, will be hardened _as long as
you remain determined, but no longer_. They will relax when the occasion
for determination has passed. The habit of instantly tensing your
muscles temporarily whenever you need to be determined will very greatly
strengthen and improve the efficiency of your brain-mind center of
_determination._ But that _temporary_ hardening of your muscles will
only slightly affect the development in you of _characteristic
persistence_.
[Sidenote: Developing Determination]
Hence the training of your muscles for building the habit of
determination within you should be concentrated on exercise in _changing
swiftly_ from comparative laxity to _muscular tension_.
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