15 Nor do we boast and claim credit for the work someone else has done. Instead, we hope that your faith will grow so that the boundaries of our work among you will be extended. 16 Then we will be able to go and preach the Good News in other places far beyond you, where no one else is working. Then there will be no question of our boasting about work done in someone else's territory. 17 As the Scriptures say, "If you want to boast, boast only about the Lord ."
Matthew Henry's Commentary on 2 Corinthians 10:15-17
Commentary on 2 Corinthians 10:12-18
(Read 2 Corinthians 10:12-18)
If we would compare ourselves with others who excel us, this would be a good method to keep us humble. The apostle fixes a good rule for his conduct; namely, not to boast of things without his measure, which was the measure God had distributed to him. There is not a more fruitful source of error, than to judge of persons and opinions by our own prejudices. How common is it for persons to judge of their own religious character, by the opinions and maxims of the world around them! But how different is the rule of God's word! And of all flattery, self-flattery is the worst. Therefore, instead of praising ourselves, we should strive to approve ourselves to God. In a word, let us glory in the Lord our salvation, and in all other things only as evidences of his love, or means of promoting his glory. Instead of praising ourselves, or seeking the praise of men, let us desire that honour which cometh from God only.