For see what earnestness this godly grief has produced in you, [ESV] -- NIV: "See what this godly sorrow has produced in you:" For see in your own case the happy effects of godly sorrow. See the effects which it produced;
what earnestness, -- "carefulness" (σπουδήν spoudēn, G4710). This word properly denotes “speed, haste;” then diligence, earnest effort, forwardness. Here it is evidently used to denote the diligence and the great anxiety which they manifested to remove the evils which existed among them.
what eagerness to clear yourselves, -- (ἀπολογίαν apologian, G627). Apology, defence. This word properly means a plea or defense before a tribunal , a group, or someone; Acts 22:1; 2 Timothy 4:16.
The word here properly means “apology, or defense," for what had been done; and it probably refers here to the effort which was made by the godly part of the church to clear themselves from blame in what had occurred.
Tyndale renders it, “Yea, it caused you to clear yourselves.”
what indignation, -- G24; Indignation against the sin, and perhaps against the persons who had drawn down the censure of the apostle.
what fear, [alarm; reverent; afraid;] -- G5401; Fear lest the thing should be repeated. Fear lest it should not be entirely removed. Or it may possibly refers to the anxiety that the evil matter be corrected, and to the dread of having any vestige of the evil remaining among them.
"Fear" usually means showing reverence toward God, who is the One most offended by sin. Repentance leads to a healthy fear of the One who chastens and judges sin. (MSB)
what longing, [vehement desire] -- This may mean their fervent desire to do the right thing, or their anxious desire to see Paul again. It is used in this latter sense in 2 Corinthians 7:7.
It seems more probable that Paul refers to their anxious wish to remove the sin, since this is the topic under consideration. The point of his remarks in this verse is their indignation against the sin, and their deep grief that sin had existed and had been tolerated among them.
what concern, [zeal] -- They were zealous to remove the sin, (or some think zealous to show their attachment to Paul). They set about the work of reformation in great earnest.
what readiness to see justice done. [ punishment; revenge] -- The idea is, that they immediately set about the work of inflicting punishment [justice) on the offender. The word used here (ἐκδίκησις ekdikēsis, G1557) probably denotes “maintenance of right, protection;” then it is used in the sense of avengement, or vengeance; and then of penal retribution or punishment; see Luke 21:22; 2 Thessalonians 1:8; 1 Peter 2:14.
Tyndale renders this: “it caused punishment.”
"what avenging of wrong" The literal term is "vengeance," but it is used in the sense of meting out justice. There has been some divergence of opinion among scholars as to what exactly this verse is referring. Some assert that (1) it refers to 1 Corinthians 5:5, while others believe (2) it refers to the factions or false teachers (cf. 2 Corinthians 7:12). - Utley
At every point you have proved yourselves to be innocent in this matter. -- The sense of this is, “You have entirely acquitted yourselves of blame in this business.”
The apostle does not mean that none of them had been to blame, or that the church had been free from fault, for a large part of his first epistle was occupied in reproving them for their faults in this business (1 Corinthians 5:1-7). But he means that by their zeal and their readiness to deal with the problem when pointed out, they had removed all further blame, and had pursued an appropriate course.