St. John Chrysostom says: "It is likely that they said in praise of themselves, 'We shall convert the whole world; we shall reach the ends of the earth.' But we, the Apostle says, are not so. We act according to the measure of the rule which God has apportioned to us, a measure reaching even to you.
"Thus he does not say more of himself than he has done. What he has done, he ascribes to God. God apportioned the measure. As a householder divides vineyards among farmers, so God 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. And why do I say, 'We reached even to you with the Gospel'? I hope that, as your faith grows, when you increase in faith, our portion will be extended still farther.
"For we shall go farther to preach and labor, and not boast in what others labored over. Fittingly he called his labor a rule, a portion, and a measure. He speaks as one who has entered into possession of the world and received a beautiful inheritance.
"By this he shows that all this is God's work. Even the power to boast, he says, is given to us by God."