From Self-Development and the Way to Power, by L. W. Rogers (19)

People who fail to assert the will and bring the body into complete
subjection probably little realize what a price they pay for a
trifling physical pleasure; for until we voluntarily take the right
course we have not escaped the evolutionary necessity of compulsion
and may reasonably expect sooner or later to be thrown into an
environment that will apply the stimulus we still need to arouse the
will. It may be unpleasant while it is occurring, but what better
fortune could befall an indolent man than to find himself in
circumstances where his poverty or other necessity compels him to
subordinate bodily comfort to the reign of the will? Nature provides
the lessons we require. We may wisely co-operate with her and thus
escape the sting. But so long as we need the lesson we may be quite
sure that it awaits us.