Jesus says some stuff in the inaugural speech of his ministry that really upsets the status quo of both the religious and non-religious. In essence, he says, "If you are to follow me as King of this newly inaugurated Kingdom of God, you will need to start loving your enemies as much as yourself. You will need to start getting creative in how you deal with your oppressors in order to choose the way of love and reconciliation rather than the way of revenge and contempt. In fact, when you live as peacemakers, you best reflect what it looks like to be children of God. Those of you that choose this way of life will be blessed."
A few years later — after Jesus has been announcing the good news of the Kingdom through both word and deed — he looks over Jerusalem and begins to weep. Here is the people and the city that is to symbolize right relationship with God and humanity. It is to be a place of shalom where salvation flows through all aspects of life. It is to be the city of peace. Instead, Jesus stands on the Mount of Olives overlooking the city and laments, "If you, even you, had only recognized on this day the things that make for peace!"
Finally, Jesus, as king, messiah, and deliverer models this way of life to the point of death on a cross. Refusing to accept the lure of power through military might or pursuing peace through violence, Jesus embodies the life of suffering and self-sacrifice that he is calling his followers to emulate. Jesus, as the ultimate peacemaker, shows us that the life and work of peacemaking isn't some fairy tale euphoria, but the gritty, subversive and sacrificial life of faithfulness to a God and kingdom that lives by a different standard than the systems and powers of the world.