HistoricalChristian.Faith

2 Corinthians 10:16

16 To preach the gospel in the regions beyond you, and not to boast in another man's line of things made ready to our hand.
Commentaries
Clement of Alexandriaon 2 Corinthians 10:15-16AD 215
The primacy of knowledge the apostle shows to those capable of reflection, in writing to those Greeks of Corinth, in the following terms: "But having hope, when your faith is increased, that we shall be magnified in you according to our rule abundantly, to preach the Gospel beyond you." He does not mean the extension of his preaching locally: for he says also that in Achaia faith abounded; and it is related also in the Acts of the Apostles that he preached the word in Athens. But he teaches that knowledge (gnosis), which is the perfection of faith, goes beyond catechetical instruction, in accordance with the magnitude of the Lord's teaching and the rule of the Church.
Ambrosiasteron 2 Corinthians 10:16AD 384
What Paul wants is to preach the gospel to those to whom the message has not yet been given, so that God will be glorified by his labor.
Source: COMMENTARY ON PAUL’S EPISTLES
John Chrysostomon 2 Corinthians 10:15-16AD 407
"Not glorying beyond" our "measure," that is, "in other men's labors, but having hope that as your faith groweth, we shall be magnified in you according to our province unto further abundance, so as to preach the Gospel even unto the parts beyond you, and not to glory in another's province in regard of things ready to our hand."

He sets forth a large accusation of them on these grounds, both that they boasted of things without their measure, and of other men's labors; and that whilst the whole of the toil was the Apostles', they plumed themselves upon their labors. 'But we,' says he, 'showed these things in our deeds. We will not imitate those men therefore, but will say such things where our deeds bear us witness. And why,' saith he, 'do I say, you?' "for I have hope that as your faith groweth;" for he doth not assert absolutely, preserving his own character, but, 'I hope,' he says, 'if you make progress, that our province will be extended even farther, "to preach the Gospel in the regions beyond." For we shall advance farther yet,' he says, 'so as to preach and labor, not so as to boast in words of what other men have labored.' And well did he call it "province and measure," as though he had come into possession of the world, and a rich inheritance; and showing that the whole was wholly God's. 'Having then such works,' he says, 'and expecting greater, we do not boast as they do who have nothing, nor do we ascribe any part to ourselves, but the whole to God.'
Theophylact of Ohridon 2 Corinthians 10:15-16AD 1107
He shows that those people boast in the labors of the apostles and boast without measure, that is, excessively and in others' labors. But we are not like that; rather, having reached you, we boldly say that we have reached you. In this we hope, without doubt, in God (for Paul did not intend to put himself forward) — that, having sufficiently taught and increased your faith, we will be magnified among you. For a teacher is magnified when he multiplies the achievements of his disciples and abundantly increases his portion, that is, expands the measure of the portion that he received. So what do we hope for? That we will preach the Gospel even beyond you, and perhaps will boast even further, if we bring them benefit. As a steward of the universe and architect, he everywhere speaks of portion and measure, and to show that all this belongs to God, Who determines this portion and this measure, he also cites the following passage.
Thomas Aquinason 2 Corinthians 10:16AD 1274
Secondly, we hope to be magnified in the conversion of others by you; therefore he says, abundantly, i.e., in the abundance of preaching not only among you but even in lands beyond you; and this according to our rule, i.e., according as Christ has enjoined us to preach not only to you but to all the Gentiles "Go into all the world and preach the gospel to the whole creation" (Mk. 16:15). Without boasting of work already done in another's field, i.e., we do not hope to glory, nor do we glory in another man's rule. As if to say: not in things prepared by others, i.e., whom others have brought to the faith, but I will bear fruit among those to whom others have not preached: "Thus making it my ambition to preach the gospel, not where Christ has already been named" (Rom. 15:20). But to the contrary, Peter preached at Rome before Paul preached there. I answer that he does not say this as though refusing to preach where another has preached; but he says that he intends to preach even where no other have preached.