2:5-11 The apostle desires them to receive the person who had done wrong, again into their communion; for he was aware of his fault, and much afflicted under his punishment. Even sorrow for sin should not unfit for other duties, and drive to despair. Not only was there danger last Satan should get advantage, by tempting the penitent to hard thoughts of God and religion, and so drive him to despair; but against the churches and the ministers of Christ, by bringing an evil report upon Christians as unforgiving; thus making divisions, and hindering the success of the ministry. In this, as in other things, wisdom is to be used, that the ministry may not be blamed for indulging sin on the one hand, or for too great severity towards sinners on the other hand. Satan has many plans to deceive, and knows how to make a bad use of our mistakes.

11. Literally, "That we may have no advantage gained over us by Satan," namely, by letting one of our members be lost to us through despair, we ourselves furnishing Satan with the weapon, by our repulsive harshness to one now penitent. The loss of a single sinner is a common loss; therefore, in 2Co 2:10, he said, "for your sakes." Paul had "delivered" the offender "to Satan for the destruction of the flesh, that the Spirit might be saved" (1Co 5:5). Satan sought to destroy the spirit also: to let him do so, would be to give him an advantage, and let him overreach us.

not ignorant of his devices—"Ignorant" and "devices" are words akin in sound and root in Greek: we are not without knowledge of his knowing schemes.