One of the most prominent characteristics of the Psalter is that it is incurably optimistic about the progress of the Kingdom of God in the world. There will be a final judgment (9:7, 8, 17; 96:13) but in the end, “All the ends of the earth will remember and turn to the LORD, and all the families of the nations will worship before Thee. For the kingdom is the LORD’S, and He rules over the nations” (Psalm 22:27-28; 46:10; 47:8; 66:7; 67:4; 72:11; 86:9). It has been said with justification that the Psalter itself is the strongest argument for a postmillennial view of history. The seeds of robust evangelism are in the Psalter as nowhere else in Scripture. The Great Commission is in fact just the rebirth of a theme that runs throughout the Book of Psalms. What greater incentive can we possibly have for evangelism than the fact that God promises success to the endeavor, that one day all the nations of the world will worship our God? The Psalter is full to overflowing with such promises. There is much talk these days about the need for evangelism. If the church wants a word from the LORD on this subject, it need only turn to the Book of Psalms (Michael Bushell, Songs of Zion, 36)