John Chrysostom
Having explained that condescension is most useful, that it is the summit of perfection, and that he himself, who had attained perfection more than all, or rather surpassed it by not taking support from his disciples, also condescended more than all, the Apostle then rebukes the Corinthians with greater force. He has shown us the time for both, perfection and condescension. He now suggests that their action, which seems to result from perfection, is labor in vain. He does not say this plainly, lest they become hardened, but he expresses it through his judgments. Earlier he said that they sin against Christ, destroy the brethren, and receive no benefit from perfect knowledge if it is not joined with love.
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Now he again turns to a well-known example and says: "Do you not know that those who run in a race all run, but one receives the prize?" He does not say this as though only one of all can be saved. May it not be so. Rather, he means that we must apply great diligence. In the stadium, of the many who enter the contest, not many are crowned. Only one attains this. Therefore it is not enough merely to enter the contest, anoint oneself, and wrestle. So here also it is not enough merely to believe and to struggle in some fashion. Unless we struggle so as to show ourselves blameless to the end and attain the reward, we receive no benefit. Though you may consider yourself perfect in knowledge, he says, you have not yet attained everything. He hints at this in the words: "So run that you may obtain." From these words it follows that they have not yet attained. Then he also teaches the manner of attainment.