5 If anyone has caused grief, he has not so much grieved me as he has grieved all of you to some extent—not to put it too severely. 6 The punishment inflicted on him by the majority is sufficient. 7 Now instead, you ought to forgive and comfort him, so that he will not be overwhelmed by excessive sorrow. 8 I urge you, therefore, to reaffirm your love for him. 9 Another reason I wrote you was to see if you would stand the test and be obedient in everything. 10 Anyone you forgive, I also forgive. And what I have forgiven—if there was anything to forgive—I have forgiven in the sight of Christ for your sake, 11 in order that Satan might not outwit us. For we are not unaware of his schemes. — 2 Cor. 2:5-11 NIV
It appears that someone in the church at Corinth had done something that was deserving of discipline by the church body. Whatever the action was, it had caused a great deal of grief in the church. Paul is writing to tell them that the discipline has been sufficient and now it it time for the church to move on and let the healing begin. The church now needs to restore that one to their fellowship and reaffirm their love for him or he could be completely overwhelmed. In every family, whether it be our church or our physical family, there are disagreements, some severe enough to be deserving of corrective action. But once that action has been taken, it is time to restore and reaffirm our love for each other.
1 Brothers and sisters, if someone is caught in a sin, you who live by the Spirit should restore that person gently. But watch yourselves, or you also may be tempted. — Galatians 6:1 NIV
The restoration is not a favor to the perpetrator, but a necessary step in the forgiving process that brings glory to God. True forgiveness releases all anger and resentment against that person and allows us to enjoy the freedom we have in God’s forgiveness of our sins. It also defeats satan’s schemes since it will keep us from allowing a root of bitterness to grow in us, which will steal our joy.
14 Make every effort to live in peace with everyone and to be holy; without holiness no one will see the Lord. 15 See to it that no one falls short of the grace of God and that no bitter root grows up to cause trouble and defile many– Hebrews 12:14, 15 NIV