Israelite kings were to act as God’s representatives, ensuring justice by ruling wisely and fairly; they often failed in this regard. In Isaiah’s vision, God raises up an ideal Davidic king who will perfectly reflect the rule of the God he represents. Endowed with divine gifts, the king will bring down the “ruthless” and the “wicked” through right judgment (“the rod of his mouth”). Further, he will usher in an era in which all creaturely violence will end. “Natural enemies” will belong to the “peaceable kingdom” brought about by the royal icon of God. Such will be the magnificence and beneficence of the kingdom that other nations will be drawn to it.
Paul reminds his Roman readers that the story of Israel, in which the promises to the ancestors were fulfilled first in ancient times and then more completely in Christ, gives evidence of God’s trustworthiness. One aspect of those promises was that all the families of the earth would find blessing through Abraham’s descendants (Genesis 12:3). Thus, the fulfillment of those promises also included the extension of God’s mercy not just to Israel but ultimately, in Jesus Christ, to all the nations. God wishes to gather all peoples together in Christ—a divine intention that encourages the Romans to seek unity among themselves.
John the Baptist’s message of repentance (metanoia, change of mind and direction) draws large crowds, who are preparing for the coming of God’s kingdom. This kingdom is understood eschatologically, as a time of consummation and judgment. Foreshadowing what is to come, John has harsh words for the religious leaders, who do not possess a repentant disposition. Anticipating a claim that they have no need of repentance to prepare themselves, John assures them that God is sending One who will see, not one’s birth status, but one’s heart, and will judge accordingly, baptizing in fire and the Holy Spirit, which is to say, with the power and wisdom of God. John’s message highlights that this is a moment of decision for everyone.