See how the very fact that you were made sorry from a godly motive has produced earnestness in you! [It produced] a desire to vindicate yourselves [i.e., by making amends for your wrongdoing]; an attitude of just anger [i.e., toward the wrongdoers]; a sense of fear [i.e., a fear of God for doing wrong]; an eager desire [i.e., to do the right thing]; a zeal [i.e., to correct problems]; and an attitude of avenging [i.e., that punished the wrongdoer]. You demonstrated in everything [you did] that you were pure [i.e., innocent] in this matter. [Note: This whole description of their conduct appears to be a reference to the incident mentioned in 2:1-11].

And we have sent [i.e., are sending] with them our brother [Note: This is a different person from the one mentioned in verse 18], who has often proven his diligence to us in many ways, and is now proving to be even more diligent because of the great confidence he has in you [i.e., confidence in the Corinthians completing their collection for the poor].

For if any Macedonians come with me and learn that you are not prepared, we, not to mention you, will be ashamed for having been so over confident.