Verse 20. Therefore we are ambassadors for Christ-we beseech you in Christ's stead - Herein the apostle might appear to some "transported beyond himself." In general he uses a more calm, sedate kind of exhortation, as in the beginning of the next chapter. What unparalleled condescension and divinely tender mercies are displayed in this verse! Did the judge ever beseech a condemned criminal to accept of pardon? Does the creditor ever beseech a ruined debtor to receive an acquittance in full? Yet our almighty Lord, and our eternal Judge, not only vouchsafes to offer these blessings, but invites us, entreats us, and, with the most tender importunity, solicits us, not to reject them.
Verse 21. He made him a sin offering, who knew no sin - A commendation peculiar to Christ. For us - Who knew no righteousness, who were inwardly and outwardly nothing but sin; who must have been consumed by the divine justice, had not this atonement been made for our sins. That we might be made the righteousness of God through him - Might through him be invested with that righteousness, first imputed to us, then implanted in us, which is in every sense the righteousness of God.