Paul's second letter to the Corinthians, 5:16-21
5:16 From now on, therefore, we regard no one from a human point of view; even though we once knew Christ from a human point of view, we know him no longer in that way.
5:17 So if anyone is in Christ, there is a new creation: everything old has passed away; see, everything has become new!
5:18 All this is from God, who reconciled us to himself through Christ, and has given us the ministry of reconciliation;
5:19 that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting the message of reconciliation to us.
5:20 So we are ambassadors for Christ, since God is making his appeal through us; we entreat you on behalf of Christ, be reconciled to God.
5:21 For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.