Augustine of Hippo
I did not believe that Psalm 108 needed a detailed explanation, as I have previously discussed it in Psalms 57 and 60, of which this psalm is a composition. The concluding section of Psalm 57 corresponds to the line: "Thy glory is above all the earth." From this point to the end corresponds to the final part of Psalm 60. Likewise, the latter section of Psalm 135 aligns with Psalm 115 in the phrase: "The images of the Gentiles are but gold and silver," just as Psalms 14 and 53 present similar themes throughout.
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Therefore, any minor variations in Psalm 108, when compared to its composite parts, can be easily understood; for instance, in Psalm 57 we find the expression "I will sing and praise; awake, my glory," while in Psalm 108 it reads, "I will sing and praise my glory," omitting the command to awaken. Additionally, "thy mercy is great" is articulated as "thy mercy is great above the heavens" here, capturing the essence that it extends to the heavens and beyond, which is what “above the heavens” signifies. In Psalm 60, we encounter "I will rejoice, I will divide Shechem," whereas here it is rendered as "I will exalt, and divide Shechem," revealing that the division of Shechem, foretold to occur after the Lord’s exaltation, is indeed connected to this rejoicing — for He rejoices because of His exaltation. This is corroborated elsewhere, where it is stated, "Thou hast turned my heaviness into joy; Thou hast taken off my vesture, and girded me with joy." Furthermore, in one verse we read "Ephraim, the strength of my head," while here it is "Ephraim, the lifting up of my head." The strength derives from acceptance; He empowers us by accepting and producing fruit through us, for the name Ephraim signifies “fruitfulness.” This acceptance is realized when we receive Christ, who, as the Head of the Church, uplifts us. The phrases that may perplex us in the earlier psalm coexist with similar ideas in this one, as we encounter the term "our enemies."
This psalm conveys that titles which may appear to reference historical events are more accurately interpreted in a prophetic manner, aligned with the intention of composing psalms. Even so, this psalm incorporates the concluding elements from two psalms, which have different titles. It signifies that both parts converge on a shared theme, not merely on the surface of history but within the depths of prophecy, with the subjects of both united in one title, that of the Song or Psalm of David. This bears no resemblance to the previous titles, aside from the name David. Throughout various scriptures, as stated in the Epistle to the Hebrews, God spoke in times past to the fathers through the prophets, yet He also spoke of the one He would send later so that the prophetic words might be fulfilled, for all the promises of God find their affirmation in Him.