Commentaries
13:7-10 The most desirable thing we can ask of God, for ourselves and our friends, is to be kept from sin, that we and they may not do evil. We have far more need to pray that we may not do evil, than that we may not suffer evil. The apostle not only desired that they might be kept from sin, but also that they might grow in grace, and increase in holiness. We are earnestly to pray to God for those we caution, that they may cease to do evil, and learn to do well; and we should be glad for others to be strong in the grace of Christ, though it may be the means of showing our own weakness. let us also pray that we may be enabled to make a proper use of all our talents.
10. Therefore—because I wish the "sharpness" to be in my letters rather than in deeds [Chrysostom].
edification … not to destruction—for building up … not for casting down. To "use sharpness" would seem to be casting down, rather than building up; therefore he prefers not to have to use it.