The work of an ambassador of Christ is mainly "reconciliation." Why is this necessary? Man has been separated from God because of sin (Isaiah 59: 1).
God wants to be reconciled with his creatures, has made provision for his forgiveness and has appointed ambassadors to effect reconciliation.
An ambassador must be reconciled with God and with his neighbor (Matthew 5: 23,24; 6: 12,14,15; 1 John 4: 20,21).
Then you should strive to reconcile others with God and with your neighbor (2 Corinthians 5:20).