2 Corinthians 2:11

that no advantage may be gained over us by Satan: for we are not ignorant of his devices. [There is a close correlation between verse 10 and 1 Corinthians 5:3. There Paul identified himself with the church, and, though absent, anticipated its action and acted with it. Here he ratifies beforehand the action which he bids it take. There he acted in the name of the Lord and here he does it in the presence of Christ. He forgives the sinner for the sake of the church, that he may not be lost to the church. When a church, through carelessness in exercising mercy and forgiveness, loses a member, it is permitting Satan to overreach it. Paul was too well versed in Satan's methods to be thus outwitted by that adversary.]