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.
15. "Not boasting to unmeasured bounds (that is, not exceeding our own bounds by boasting) of (literally, 'in') other men's labors."
when—"As your faith goes on increasing." The cause of his not yet reaching with the Gospel the regions beyond Corinth, was the weakness as yet of their faith. He desired not to leave the Corinthians before the proper time, and yet not to put off preaching to others too long.
enlarged by you—Greek, "in your case." Our success in your case will give us an important step towards further progress beyond you (2Co 10:16).
according to our rule—according to our divinely assigned apportionment of the area or sphere of our work; for "we stretch not ourselves beyond our measure" (2Co 10:14).
abundantly—Greek, "unto exceeding abundance": so as to exceed the limits we have yet reached (2Co 10:16).