Paul knows that if the earthly tent they live in is destroyed, they have a building from God, a house not made with hands, eternal in the heavens. Meanwhile they groan, longing to put on their heavenly dwelling, so that what is mortal may be swallowed up by life. God himself prepared them for this and gave them the Spirit as a guarantee.
So they are always confident. While they are at home in the body, they are away from the Lord, for they walk by faith and not by sight. They would rather be away from the body and at home with the Lord, but in any case their aim is to please him, for all must appear before the judgment seat of Christ, to receive what is due for what they have done in the body, whether good or evil.
Knowing the fear of the Lord, they persuade people. Paul is not commending himself again but giving the Corinthians cause to boast on his behalf. The love of Christ controls them, because they are convinced that one has died for all, therefore all have died, and he died for all so that those who live might no longer live for themselves but for him who died and was raised for them. So from now on they regard no one according to the flesh, even if they once regarded Christ that way. Therefore, if anyone is in Christ, he is a new creation; the old has passed away, the new has come.
All this is from God, who reconciled us to himself through Christ and gave us the ministry of reconciliation: in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting to us the message of reconciliation. We are ambassadors for Christ, God making his appeal through us: be reconciled to God. For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.