We are Christ’s ambassadors, God making His appeal as it
were through us. We [as Christ’s personal representatives] beg you for His sake to lay hold of the divine favor [now offered you] and be
reconciled to God.
(2 Corinthians 5:20 AMP)
We are all ambassadors of whom or what we represent. Believers are ambassadors of Christ representing His righteousness, peace and joy to bring colour to a dark world.