4:14-21 In reproving for sin, we should distinguish between sinners and their sins. Reproofs that kindly and affectionately warn, are likely to reform. Though the apostle spoke with authority as a parent, he would rather beseech them in love. And as ministers are to set an example, others must follow them, as far as they follow Christ in faith and practice. Christians may mistake and differ in their views, but Christ and Christian truth are the same yesterday, to-day, and for ever. Whenever the gospel is effectual, it comes not in word only, but also in power, by the Holy Spirit, quickening dead sinners, delivering persons from the slavery of sin and Satan, renewing them both inwardly and outwardly, and comforting, strengthening, and establishing the saints, which cannot be done by the persuasive language of men, but by the power of God. And it is a happy temper, to have the spirit of love and meekness bear the rule, yet to maintain just authority.
18. some … as though I would not come—He guards against some misconstruing (as by the Spirit he foresees they will, when his letter shall have arrived) his sending Timothy, "as though" he "would not come" (or, "were not coming") himself. A puffed-up spirit was the besetting sin of the Corinthians (compare 1Co 1:11; 5:2).