Augustine of Hippo
I believed that Psalm CVIII-1 did not necessitate further explanation, as I have already discussed it in Psalms LVII-1 and LX-1, which comprise its components. The concluding section of Psalm LVII-1 represents the beginning of this psalm with the line: "Thy glory is above all the earth." From that point to the end aligns with the latter portion of Psalm LX-1; similarly, the final segment of Psalm CXXXV-1 matches that of Psalm CXV-1, specifically the verse that states, "The images of the Gentiles are but gold and silver." Additionally, Psalms XIV and LIIID share the same textual flow, with minor variations in the middle. Therefore, any subtle distinctions observed in this Psalm CVIII as compared to its two constituent parts are readily understandable.
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For example, in Psalm LVIID, it states, "I will sing and praise; awake, my glory," while here it declares, "I will sing and praise my glory." The former suggests, "Awake, that he may sing and praise." Furthermore, the phrase "thy mercy is great" (or, as some render, "exalted") "unto heaven" in that passage becomes "above the heavens" here, indicating that while His mercy reaches the heavens, it is even greater as it surpasses them. In Psalm LX-1, the expression "I will rejoice, I will divide Shechem" appears as "I will exalt, and divide Shechem" here, clarifying that this division was foretold to occur following the exaltation of the Lord. Thus, His rejoicing directly pertains to that exaltation. This is echoed in another passage where it states, "Thou hast turned my heaviness into joy; Thou hast removed my sackcloth and clothed me with gladness." Here, "Ephraim, the strength of my head," becomes "Ephraim, the lifting up of my head," signifying that strength derives from acceptance, meaning He empowers individuals by accepting them and allowing them to bear fruit, as the name Ephraim suggests "fruitful." Acceptance is also understood when we receive Christ or perceive Him, who is the Head of the Church, lifting us up. The perplexing expressions found in the earlier psalm mirror those that refer to our adversaries in this context.
This psalm illustrates that titles appearing to reference historical events are more appropriately interpreted in a prophetic light, reflecting the intention behind the psalms' composition. While this psalm incorporates the concluding segments of two others, their titles differ. It indicates that both converge on a shared purpose that transcends mere historical context and delves into the depths of prophecy, uniting both in one title: the Song or Psalm of David, differing from previous titles except for the reference to David. As the Epistle to the Hebrews asserts, God spoke in countless ways in times past through the prophets (Hebrews 1:1), ultimately directing His words towards the one He sent to fulfill the prophecies, for in Him, all the promises of God find their affirmation (2 Corinthians 1:20).