Psalms 68:32

The psalmist, having prayed for and prophesied of the conversion of the Gentiles, here invites them to come in and join with the devout Israelites in praising God, intimating that their accession to the church would be the matter of their joy and praise (Psa 68:32): Let the kingdoms of the earth sing praises to the Lord; they all ought to do it, and, when they become the kingdoms of the Lord and of his Christ, they will do it. God is here proposed to them as the proper object of praise upon several accounts: I. Because of his supreme and sovereign dominion: He rides upon the heavens of heavens which were of old (Psa 68:33); compare Psa 68:4. He has from the beginning, nay from before all time, prepared his throne; he sits on the circuit of heaven, guides all the motions of the heavenly bodies; and from the highest heavens, which are the residence of his glory, he dispenses the influences of his power and goodness to this lower world. II. Because of his awful and terrible majesty: He sends out his voice, and that a mighty voice. This may refer either generally to the thunder, which is called the voice of the Lord and is said to be powerful and full of majesty (Psa 29:3, Psa 29:4), or in particular to that thunder in which God spoke to Israel at Mount Sinai. III.

— Matthew Henry's Concise Commentary (public domain)

To Him who is presented as riding in triumph through His ancient heavens and proclaiming His presence--to Him who, in nature, and still more in the wonders of His spiritual government, out of His holy place (Psa 43:3), is terrible, who rules His Church, and, by His Church, rules the world in righteousness--let all nations and kingdoms give honor and power and dominion evermore. Next: Psalms Chapter 69

— Jamieson-Fausset-Brown Commentary (public domain)