To the Chief Musician. On stringed instruments. A Psalm. A Song.
1 God be merciful to us and bless us,
And cause His face to shine upon us, Selah
2 That Your way may be known on earth,
Your salvation among all nations.
3 Let the peoples praise You, O God;
Let all the peoples praise You.
4 Oh, let the nations be glad and sing for joy!
For You shall judge the people righteously,
And govern the nations on earth. Selah
5 Let the peoples praise You, O God;
Let all the peoples praise You.
6 Then the earth shall yield her increase;
God, our own God, shall bless us.
7 God shall bless us,
And all the ends of the earth shall fear Him.
Commentators do not list the 67th Psalm as among the Messianic Psalms, but without a doubt it will have its fulfillment at the time He reigns, and cannot be fulfilled until then. The sinful, selfish nature of fallen man is such that he does not want God to rule the earth. The portrait painted by the inspired writer is that of a universal kingdom of God, in which the nations will be glad and sing for joy. For the first time in the history of the world, the the nations and the people will be judged righteously. For the first time, since the fall of man in the Garden of Eden, will the earth yield her increase of fruit, as it did before sin entered the world. — Phillips, page 139.
Structurally and thematically this psalm is organized in a beautifully symmetrical-chiastic fashion, with the first and third section focusing on God’s solicitude for Israel as the basis for worldwide praise, culminating in the center section (in which verses 3 and 5 mirror each other exactly) with a focus on God’s ideal and ultimate sovereignty over all nations, including Israel. Notably, the number of verses in this psalm, reflecting its symmetrical-chiastic structure, is seven, which number in the Bible is indicative of perfection and completion—hence underscoring even at the structural level that this is not only a picture of what the nations should ideally do, but also what they will one day really do when God establishes His kingdom on earth. — Wechsler, page 173.
Wechsler believes Psalm 67 was written by David.
This Psalm was probably composed, like Psalm 65, to be used at one of the great annual festivals, probably the Feast of Tabernacles. — Meyer, page 83.
The psalmist begins by adopting the phraseology of the priestly (or “Aaronic”) benediction in Numbers 4:24-26, in which the key expressions “be gracious,” “bless,” and “cause His fact to shine upon” all specifically signify spiritual provision (regardless of outer circumstances), “rest” (in the salvific sense” and intimacy with God. — Wechsler, page 173.
Regardless of what may happen throughout the course of human history, it will ultimately, inevitably culminate in all the peoples of the earth offering their praise to God when, in the person of His Son, He establishes His kingdom permanently on earth, judging the peoples with uprightness and guiding the nations on earth. — Wechsler, page 174.
According to the Scriptures God chose Israel as His agent to lead all nations to Him; and to this end He gave her a sufficient revelation of Himself and of His salvation. Israel refused this honor; but the Divine purpose has not thereby been defeated. She will be restored; she will yet publish peace to the nations, and win all peoples to the knowledge and service of God.
Here appears a deep principle of the Word of God, true in all dispensations, that the spiritual welfare of those far from God is dependent upon revival and restoration of soul among the people of God … The prophetic doctrine that the salvation of the world depends upon the restoration of Israel (Romans 11:12, 15) is repeated in the last two verses, as it was affirmed in the first two. — Williams, pages 351-352
This one seems pretty straightforward. Almost all my commentaries (except Guthrie) agree that this psalm points forward to the Millennial Kingdom. I see no reason to think otherwise.