Augustine of Hippo
I believed that Psalm 108 required no further clarification, as I have already discussed it in Psalm 57 and Psalm 60, which together form this psalm. The concluding part of Psalm 57 serves as the beginning of Psalm 108, particularly with the phrase: "Thy glory is above all the earth." The section from there to the end corresponds with the final portion of Psalm 60. Similarly, the latter part of Psalm 135 matches that of Psalm 115 in the assertion: "The images of the Gentiles are but gold and silver," while Psalms 14 and 53, despite minor variations in the middle, share the same structure throughout.
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Consequently, any minor discrepancies in this Psalm 108, when compared to the preceding two, can be understood; for example, in Psalm 57, the phrase "I will sing and praise; awake, my glory" contrasts with "I will sing and praise my glory" here. In that context, it states, "Awake, that he may sing and praise," while here it proclaims, "Thy mercy is great above the heavens," instead of "Thy mercy is great unto heaven" (or as others interpret, "exalted"). This is to express that it is indeed great in a way that surpasses even the heavens themselves.
Furthermore, in Psalm 60, "I will rejoice, I will divide Shechem" is altered to "I will exalt, and divide Shechem" here. This implies a prophecy regarding the division of Shechem after the Lord’s exaltation, reinforcing that this joy correlates to that exaltation, as He rejoices because He is lifted up. Thus, it is said elsewhere, "Thou hast turned my heaviness into joy; Thou hast taken off my vesture, and girded me with joy." The reference to Ephraim shifts, where it states "the strength of my head" there, but here it signifies "the lifting up of my head." Strength is derived from acceptance; He empowers individuals through acceptance and by bearing fruit in us, for Ephraim signifies "bringing forth fruit." Acceptance is realized when we receive Christ, or it can refer to Christ, the Head of the Church, who elevates us. Moreover, the terms that perplex us in the earlier psalm appear unchanged in this context, as with "our enemies."
This psalm instructs us that titles which might appear historical are primarily to be interpreted prophetically, according to the intention behind the Psalms' composition. Yet, this psalm incorporates the latter sections of two distinct psalms, each with different titles. This signifies that both ultimately focus on a shared subject, not merely within historical confines but deeply rooted in prophecy, with both subjects converging into one, designated the Song or Psalm of David, which bears no resemblance to the previous titles but aligns with the name David. As the Epistle to the Hebrews states, God communicated in various manners to the ancestors through the prophets, yet concerning the one He later sent, fulfilling the words of those prophets because all the promises of God find affirmation in Him.