2 Corinthians 10:15 - Matthew Poole's English Annotations on the Holy Bible

So that although we have boasted of you, we have not boasted of things without our measure; that is, of things that are not, or (as the apostle expounds himself) of things that were not done by him but by other men; for his line did reach unto them, and his labours had been employed and made successful amongst them. And he declares his hope, that when the gospel should have had its full success amongst them, and their faith should be increased, (either by the addition of more persons to the church amongst them, or by the perfecting of their faith, and other graces), they, who were apostles and the ministers of the gospel to them, should by it be magnified, or made great; to wit, by their means, who using much navigation, would have opportunities to comment the gospel, and the ministry of it, to other people, amongst whom they should come: wherein yet they should not exceed their rule; for though ordinary ministers be fixed in particular churches and places, yet the apostles rule was to go and preach the gospel over the whole world, being tied to no certain people or places.