Irenaeus

On this account also Paul the Apostle says to the Corinthians, "Know ye not, that they who run in a racecourse, do all indeed run, but one receiveth the prize? So run, that ye may obtain. Every one also who engages in the contest is temperate in all things: now these men do it that they may obtain a corruptible crown, but we an incorruptible. But I so run, not as uncertainty; I fight, not as one beating the air; but I make my body livid, and bring it into subjection, lest by any means, when preaching to others, I may myself be rendered a castaway." This able wrestler, therefore, exhorts us to the struggle for immortality, that we may be crowned, and may deem the crown precious, namely, that which is acquired by our struggle, but which does not encircle us of its own accord. And the harder we strive, so much is it the more valuable; while so much the more valuable it is, so much the more should we esteem it. And indeed those things are not esteemed so highly which come spontaneously, as those which are reached by much anxious care.