2 Corinthians 11:18 - Ellicott's Commentary On The Whole Bible

Seeing that many glory after the flesh. — To glory, or boast, after the flesh, as interpreted by 2 Corinthians 5:16 (where see Note), is to lay stress on things which are the accidents of the spiritual life, not of its true essence — on descent, prerogatives, rank, reputation, and the like. There is a touch half of irony, half of impatience, in the way in which the Apostle says that he too will for once descend to their level and do as they do.