Jesus identifies Himself with Yahweh in the Sermon on the Mount when He compares His disciples to the persecuted prophets of old (Matt. 5:11–12; Jer. 37–38). The disciples who speak for Jesus are like the prophets who spoke for the Lord of the covenant; therefore, Christ implies His divine sovereignty.
The prophets carried out their ministries in full view of the people of Israel, and so we are not surprised to see that their successors, the disciples of Jesus, not build the kingdom of God in secret. This is the point of this Sunday’s sermon—that the church is to have a transformative effect on the surrounding society.