God reigns over the nations: God sits upon the throne of his holiness.
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Augustine of Hippo
9. "God shall reign over all nations" (ver. 8). Who reigned over one nation, "shall reign" (saith He) "over all nations." When this was said, God reigned over one nation. It was a prophecy, the thing was not yet shown. Thanks be to God, we now see fulfilled what before was prophesied. A written promise God sent unto us before the time, the time fulfilled He hath repaid us. "God shall reign over all nations," is a promise. "God sitteth upon His Holy Seat." What then was promised to come, now being fulfilled, is acknowledged and held. "God sitteth upon His Holy Seat." What is His Holy Seat? Haply saith one, The Heavens, and he understandeth well. For Christ hath gone up, as we know, with the Body, wherein He was crucified, and sitteth at the right hand of the Father; thence we expect Him to come to judge the quick and the dead. "God sitteth upon His Holy Seat." The Heavens are His Holy Seat. Wilt thou also be His Seat? think not that thou canst not be; prepare for Him a place in thy hear...