18. many—including the "false teachers."
after the flesh—as fleshly men are wont to boast, namely, of external advantages, as their birth, doings, &c. (compare 2Co 11:22).
I will glory also—that is, I also will boast of such fleshly advantages, to show you that even in these I am not their inferiors, and therefore ought not to be supplanted by them in your esteem; though these are not what I desire to glory in (2Co 10:17).