Robert Murray M'Cheyne emphasizes the role of ministers as ambassadors for Christ, highlighting their character, the message of reconciliation they bring, and the grounds of their mission rooted in Christ's sacrifice. He explains that ministers do not come in their own name but convey a message of mercy, urging sinners to be reconciled to God. M'Cheyne underscores the significance of Christ's sinlessness and the profound love demonstrated in His willingness to bear our sins, offering righteousness to all who believe. The sermon calls for a heartfelt response to God's invitation for reconciliation, stressing the urgency and tenderness of the message delivered by ministers.