Therefore, we are ambassadors for Christ, as though God were making an appeal through us; we beg you on behalf of Christ, be reconciled to God. — 2 Corinthians 5:20
Ambassador: an authorized messenger or representative
What is our message if we are messengers for Christ? Reconciliation. To be an effective ambassador we must first reconcile ourselves to God through Christ.
and He died for all, so that they who live might no longer live for themselves,
but for Him who died and rose again on their behalf.
— 2 Corinthians 5:15
Our repentance and surrender to Christ as our Savior, accepting His grace/favor and believing God raised Him from the dead reconciles us to God. We are in Christ:
Therefore if anyone is in Christ, he is a new creature;
the old things passed away; behold, new things have come.
— 2 Corinthians 5:17
Being in Christ our love for Him controls us. (2 Corinthians 5:14) God has prepared us to be ambassadors for Christ and given us the Spirit. (v.5) By the Spirit we walk by faith, not by sight. God reconciled us to Himself through Christ and gave us the ministry of reconciliation. (v.18)
What is our message?
He made Him who knew no sin to be sin on our behalf,
so that we might become the righteousness of God in Him.
— 2 Corinthians 5:21
Continually seeking Him,