I Timothy 4:8 Amp
For physical training is of some value — useful for
a little; but godliness [spiritual training] is useful and
of value in everything and in every way, for it holds
promise for the present life and also for the life which is to come.

Just like an athlete trains his physical body, we are to
train our spiritual “bodies.” And here is the reason:
it’s valuable for every thing! And that doesn’t stop
with this life; it carries on over into the next. Every
time. Makes training ourselves seem like a “duh,”
doesn’t it ? He even follows this with a verse that
emphasizes that this is true for every one.

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For the story behind Three By Fives, click here.