Matthew Henry Commentary Psalms 98:4-9

"Make a joyful noise unto Jehovah, all the earth: Break forth and sing for joy, yea, sing praises. Sing praises unto Jehovah with the harp; With the harp and the voice of melody. With trumpets and sound of cornet Make a joyful noise before the King, Jehovah. Let the sea roar, and the fulness thereof; The world, and they that dwell therein; Let the floods clap their hands; Let the hills sing for joy together Before Jehovah; for he cometh to judge the earth: He will judge the world with righteousness, And the peoples with equity." — Psalms 98:4-9 (ASV)

Let all people rejoice in the establishment of Christ's kingdom, for all may benefit from it. The different orders of rational creatures in the universe seem to be described in figurative language in the reign of the great Messiah. Christ's kingdom will be a blessing to the whole creation.

We expect his second coming to begin his glorious reign. Then heaven and earth will rejoice, and the joy of the redeemed will be full.

But sin and its dreadful effects will not be completely removed until the Lord comes to judge the world in righteousness. Therefore, since we look for such things, let us be diligent that we may be found by him in peace, without spot, and blameless.