The text "shouts" the cosmic reign of Christ over all nations, a reign that is joyfully confessed by his chosen people on earth and celebrated by saints and angels in heaven. In the midst of these powerful exclamations of praise to Christ the Lamb comes a prayer for the increase of the church (st. 4). This is presumably one of the earliest "church growth" hymns!
Psalter Hymnal Handbook
Heidelberg Catechism, Lord’s Day 21, Question and Answer 54 confesses that the ascended Jesus Christ is now “head of his church, the one through whom the Father rules all things” and “through his Word and Spirit, out of the entire human race, gathers…a community chosen for eternal life...”