Deuteronomy 21; Psalms 108–109; Isaiah 48; Revelation 18
psalm 108 is rather distinctive in the book of Psalms. Apart from minor changes, it is made up of parts of two other psalms. Psalm 108:1–5 follows 57:7–11; Psalm 108:6–13 follows 60:5–12. Nevertheless the “feel” of the result is startlingly different.
Both Psalms 57 and 60 find David under enormous pressure. In the former, the superscription places David in flight from King Saul, and hiding in a cave; in the latter, David and his troops have been defeated. In both cases, however, the psalm ends in praise and confidence—and the respective sections on praise and confidence from these two psalms are now joined together to make Psalm 108. Although Psalm 108 still hints at a stressful situation that includes some chastening by God (108:11), the tone of the whole slips away from the dark moods of the early parts of the other two psalms, and in comparison is flooded with adoration and confidence.
That simple fact forces us to recognize something very important. The earlier two psalms (57 and 60) will doubtless seem especially appropriate to us when we face peril—individual or corporate—or suffer some kind of humiliating defeat. The present psalm will ring in our ears when we pause to look back on the manifold goodness of God, reminding ourselves of the sweep of his sovereignty and his utter worthiness to receive our praise. It might prove especially useful when we are about to venture on some new initiative for which our faith demands fresh grounding. This perspective of changed application occurs because the same words are now placed in a new context. And that is the point.
For although all of Scripture is true and important, deserving study, reflection, and carefully applied thought, the Lord God in his wisdom did not give us a Bible of abstract principles, but highly diverse texts woven into highly diverse situations. Despite the diversity, of course, there is still only one sweeping storyline, and only one Mind ultimately behind it. But the rich tapestry of varied human experience reflected in the different biblical books and passages—not least in the different psalms—enables the Bible to speak to us with peculiar force and power when the “fit” between the experience of the human author and our experience is especially intimate.
For this astonishing wealth, God deserves reverent praise. What mind but his, what compass of understanding but his, what providential oversight over the production of Scripture but his, could produce a work so unified yet so profoundly diverse? Here, too, is reason to join our “Amen” to the words of 108:5: “Be exalted, O God, above the heavens, and let your glory be over all the earth.”
 Carson, D. A. (1998). For the love of God: a daily companion for discovering the riches of God’s Word. (Vol. 1, p. 25). Wheaton, IL: Crossway Books.