2 Corinthians 2:9
9. For—Additional reason why they should restore the offender, namely, as a "proof" of their obedience "in all things"; now in love, as previously in punishing (2Co 2:6), at the apostle's desire. Besides his other reasons for deferring his visit, he had the further view, though, perhaps, unperceived by them, of making an experiment of their fidelity. This accounts for his deferring to give, in his Epistle, the reason for his change of plan (resolved on before writing it). This full discovery of his motive comes naturally from him now, in the second Epistle, after he had seen the success of his measures, but would not have been a seasonable communication before. All this accords with reality, and is as remote as possible from imposture [PALEY, Horæ Paulinæ]. The interchange of feeling is marked (2Co 2:4), "I wrote . . . that ye might know the love," &c.: here, "I did write, that I might know the proof of you."
2 Corinthians 13:3
3. Since—The reason why he will not spare: Since ye challenge me to give a "proof" that Christ speaks in me. It would be better if ye would "prove your own selves" (2Co 13:5). This disproves the assertion of some that Scripture nowhere asserts the infallibility of its writers when writing it.
which—"who" (Christ). is not weak—in relation to you, by me and in this very Epistle, in exercising upon you strong discipline. mighty in you—has given many proofs of His power in miracles, and even in punishing offenders (2Co 5:11, 20, 21). Ye have no need to put me to the proof in this, as long ago Christ has exhibited great proofs of His power by me among you (2Co 12:12) [GROTIUS]. It is therefore not me, but Christ, whom ye wrong: it is His patience that ye try in despising my admonitions, and derogating from my authority [CALVIN]. Philippians 2:22
22. Rare praise (Ne 7:2).
as a son with the father—Translate, "as a child (serveth) a father." served with me—When we might expect the sentence to run thus. "As a child serveth a father, so he served me"; he changes it to "served with me" in modesty; as Christians are not servants TO one another," but servants of God WITH one another (compare Php 3:17). in the gospel—Greek, "unto," or "for the Gospel."