God reigneth over the heathen - Though this is literally true in God's universal dominion, yet more is here meant. God reigns over the heathen when, by the preaching of the Gospel, they are brought into the Church of Christ.
God sitteth upon the throne of his holiness - He is a holy God; he proclaims holiness. His laws are holy, he requires holiness, and his genuine people are all holy. The throne of his holiness is the heaven of heavens; also the temple at Jerusalem; and, lastly, the hearts of the faithful.
God reigneth over the heathen - Over the “nations;” not over the “heathen” in the sense in which that term is understood now. It does not mean that God reigns, or that he has set up his throne over the people that have not the true religion, but that he is exalted over the “nations” of the earth as such; or, that he has universal dominion. See the notes at Psalm 46:10.
God sitteth upon the throne of his holiness - Upon his holy throne, The idea is, that his government is established in holiness or justice.