John Chrysostom
“We have sent with them also our brother” (v. 22). Behold, he adds yet another, and this one too with praise and approval, both his own and that of many other witnesses.
“Whose diligence we have often tested in many things,” he says, “and who is now still more diligent because of his great confidence in you.”
Having praised him for his own merits, he also praises him for his love toward them. What he said of Titus, that “being very diligent, he went to you of his own accord,” he says also of this man: “who is now still more diligent,” that is, after Paul had sown in them the seeds of love for the Corinthians.