John Chrysostom
Do you see that boasting is not a matter according to the Lord? "When you have done all," it is said, "say, We are unprofitable servants" (Lk 17:10). Yet although boasting in itself is not according to the Lord, it becomes so because of the intention. Therefore he said, "what I shall say," condemning not the cause but the words. The aim is so lofty that it makes even the words worthy of respect. Thus a killer, though killing is strictly forbidden, is often commended because of his intention. Circumcision also, though not according to the Lord, may be so according to the disposition of the heart. In the same way, one may also boast. Why then does he not speak of this circumstance in detail? Because he hastens to another subject.
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From many subjects he speaks, even to those willing to listen, only of what is useful. What he said was sufficient to turn aside every suspicion. "As though in foolishness." Earlier he said, "Would that you bore with me a little in my foolishness." Now he says, "as in foolishness." The farther he goes, the clearer he makes his speech. Then, so that you would not think he does everything "as in foolishness," he added, "in this confidence of boasting." So also elsewhere he said, "that we may not be put to shame," and then added, "in this confident boasting" (2 Cor 9:4). In another place he said, "Or what I plan, do I plan according to the flesh, so that with me there should be 'yes, yes' and 'no, no'?" (2 Cor 1:17). He showed that he cannot everywhere fulfill what he promises, because he does not plan according to the flesh. Yet lest someone conceive the same doubt about his teaching, he says, "God is faithful, that our word to you was not 'yes' and 'no'" (v. 18).