It is through the preaching of the gospel that Jesus wields his scepter in the world. To tell people the gospel is to announce the kingdom or kingship of God and his Christ. Through the gospel, we command people to submit to Jesus. Through the gospel, judgment is passed on those who reject him. We are ambassadors of the coming King, going ahead to warn of his coming. If people acknowledge his lordship, they will experience his coming rule as a blessing, life, and salvation. If they reject him, they will experience his coming as conquest and judgment.
Tim Chester and Steve Timmis, Total Church