IV. That the kingdom of the Redeemer shall be erected and maintained, to the comfort of his loyal subjects and the terror and shame of all his enemies (v. 21): The kingdom shall be the Lord's, the Lord Christ's. God shall give it to him, by putting all things into his hand, all power both in heaven and in earth; men shall give it to him, by resigning themselves to him as his willing people, and appointing him their head. Now the work of kings is to protect their subjects and suppress their enemies; and this Christ will do; he will both reward and punish. 1. The mountain of Zion shall be saved; on it saviours shall come, the preachers of the gospel, who are called saviours, because their business is to save themselves and those that hear them; and in this they are workers together with Christ, but to little purpose if he by his grace did not work together with them. 2. The mountain of Esau shall be judged; and the same that come as saviours on Mount Zion shall judge the mountain of Esau; for the word of the gospel in their mouth, that saves believers, judges unbelievers, convinces and condemns them. Christ's ministers are saviours on Mount Zion when they preach that he that believes shall be saved; but they judge the mount of Esau when they preach that he that believeth not shall be damned, which they are not only commissioned, but commanded to do, Mark xvi. 16. And in the course of God's providence his scripture is fulfilled; when God raises up friends to the church in her distress (as he raised up judges to deliver Israel of old, Judg. ii. 16), then saviours come on Mount Zion, to save it from being sunk and ruined; and when the enemies of the church are brought down, and their power broken, then is the mount of Esau judged; and this shall be done in every age in such a way as God thinks best; we may depend upon it that the gates of hell shall not prevail against the church, but the church shall prevail against them; for the kingdom shall be the Lord's; the kingdoms of the world shall become his, and he has taken, and will take, to himself his great power and reign.