Augustine of Hippo
I did not believe that Psalm 108 needs further clarification, as I have already explained it in Psalm 57 and in Psalm 60, of which this psalm is a continuation. The concluding section of Psalm 57 serves as the initial part here, particularly in the line "Thy glory is above all the earth." From this point to the end aligns with the final portion of Psalm 60; similarly, the latter section of Psalm 135 corresponds to Psalm 115, specifically in the phrase "The idols of the nations are merely gold and silver." Psalms 14 and 53, with minor modifications, maintain similar themes from start to finish. Consequently, any minor discrepancies found in this Psalm 108, as compared to the two earlier parts, are quite understandable.
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For instance, in Psalm 7, it states, "I will sing praises; awake, my glory," while here it slightly modifies to "I will sing praises, my glory." There, it suggests awakening so that one may sing and give thanks. Moreover, the line, "Thy mercy is great unto heaven" is transformed here to "Thy mercy is great above the heavens." This highlights that God’s mercy reaches the heavens, thus signifying greatness beyond them. Similarly, in Psalm 60, where it declares, "I will rejoice, I will divide Shechem," here we see "I will exalt and divide Shechem." This division of Shechem, foretold to occur following the Lord's exaltation, indicates that the joy expressed pertains directly to this exaltation, as He rejoices because He has been raised high. Consequently, it is stated in another verse, "Thou hast turned my mourning into joy; Thou hast stripped off my mourning garments and clothed me with gladness." The reference to Ephraim as "the strength of my head" here becomes "Ephraim, the lifting up of my head." In this context, strength arises from acceptance, meaning He empowers humanity through acceptance and by bringing forth fruit within us; the term Ephraim signifies "fruitfulness." Here, acceptance can be observed as we receive Christ, or as Christ, the Head of the Church, elevates us. The expressions that puzzle us in the preceding psalm now appear similarly regarding our adversaries. This psalm instructs us that titles seemingly linked to historical events might be more accurately interpreted in a prophetic sense, reflecting the intention behind the composition of psalms. Despite consisting of the concluding segments of two psalms with distinct titles, it implies that both converge on a shared subject, which does not lie merely in historical accounts but in the profound depths of prophecy. The essence of both is unified under the designation of the Song or Psalm of David—differing from prior titles but resonating through the name David itself. As indicated in numerous passages, God, as mentioned in the Epistle to the Hebrews, communicated in former times to the ancestors through the prophets; yet, He later spoke of the one whom He sent, fulfilling the words of the prophets, for all of God's promises find their fulfillment in Him.