47:5-9 Praise is a duty in which we ought to be frequent and abundant. But here is a needful rule; Sing ye praises with understanding. As those that understand why and for what reasons they praise God, and what is the meaning of the service. It is not an acceptable service, if it is not a reasonable service. We are never to forget the end of Messiah's exaltation, so continually do the prophets dwell upon the conversion of the nations to the gospel of Christ. Why do we vainly fancy that we belong to him, unless the Spirit reign in our hearts by faith? Lord, is it not thy glory and delight to give repentance to Israel and remission of sins, now that thou art exalted as a Prince and a Saviour? Set up thy kingdom in our hearts. Bring into captivity every thought to the obedience of Christ. And so sweetly constrain all the powers and faculties of the souls of thy redeemed, into holy love, fear, and delight in thee, that praise with the understanding may rise from every heart, both here and for ever, to Thee, our God.

5-7. God, victorious over His enemies, reascends to heaven, amid the triumphant praises of His people, who celebrate His sovereign dominion. This sovereignty is what the Psalm teaches; hence he adds,

sing … praises with understanding—literally, "sing and play an instructive (Psalm)." The whole typifies Christ's ascension (compare Ps 68:18).