John Chrysostom
"But we will not boast beyond measure" (v. 13), as they do. It is likely that in praise of themselves they said, "We have converted the world; we have reached the ends of the earth," and proclaimed many other such things about themselves.
"But we," says the Apostle, "are not so. We boast according to the measure of the portion which God appointed to us, a measure reaching even to you."
Thus his humility is revealed from two sides. On the one hand, he says nothing of himself beyond what he has done. On the other, even what he has done he ascribes to God.
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"According to the measure of the portion," he says, "which God appointed to us, a measure reaching even to you." "As God divides vineyards among farmers, so He appointed to each of us his own portion. Therefore we do not boast of anything greater, but of what has been given us to reach."