Paul appeals to them by the meekness and gentleness of Christ, he who is humble when face to face with them but bold when away. He begs that when he is present he may not have to show the boldness with which he expects to be daring toward some who suspect him of walking according to the flesh.
Though they live in the flesh, they do not wage war according to the flesh. The weapons of their warfare are not of the flesh but have divine power to destroy strongholds, demolishing arguments and every lofty opinion raised against the knowledge of God, and taking every thought captive to obey Christ. They are ready to punish every disobedience, once the Corinthians' obedience is complete.
Paul invites them to look at what is before their eyes. If anyone is confident that he is Christ's, let him remind himself that Paul is too. Even if he boasts somewhat more about his authority, which the Lord gave for building up and not for tearing down, he will not be ashamed. Some say his letters are weighty and strong, but his bodily presence is weak and his speech contemptible. Let such a person understand that what they are in word by letter when absent, they will be in deed when present.
Paul is ironic about those who measure and compare themselves with themselves, who are without understanding. He will not boast beyond limits but within the field God assigned him, which reached as far as Corinth. He is not overextending himself, for he was the first to come to them with the gospel of Christ. He hopes that as their faith grows, the field will extend so that he may preach the gospel beyond them, without boasting of work done by others. Let the one who boasts boast in the Lord, for it is not the one who commends himself who is approved, but the one whom the Lord commends.