Augustine of Hippo
I did not perceive that Psalm 108 needed clarification, as I have previously examined it in Psalm 57 and Psalm 60, from which this psalm is derived. The final section of Psalm 57 is reflected in the line: "Thy glory is above all the earth." The concluding verses from Psalm 60 follow from that point onwards. The last segment of Psalm 135 echoes the concluding part of Psalm 115, which states: "The images of the Gentiles are but gold and silver." Similarly, Psalms 14 and 53 also share very similar phrasing throughout. Thus, any minor variations present in this 108th Psalm in relation to its source sections can be readily reconciled.
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For instance, in Psalm 57:8, we find the phrase: "I will sing and praise; awake, my glory," while in this context it states: "I will sing and praise my glory." Here, it suggests awakening for the purpose of singing and praising. Moreover, there is mention of God's mercy being great unto heaven in one instance, contrasted with this psalm's expression of His mercy being great above the heavens. This is to indicate the extent of His mercy, reaching to the heavens, as represented by the phrase "above the heavens." Likewise, in Psalm 60, "I will rejoice, I will divide Shechem," becomes: "I will exalt, and divide Shechem" here. This implies a prophetic division of Shechem which was to occur following the Lord's exaltation, linking the rejoicing to His elevation—indeed, He rejoices because He has been exalted. As expressed elsewhere: "Thou hast turned my heaviness into joy; Thou hast taken off my vesture, and girded me with joy." There, Ephraim is described as the strength of my head, while here it is referred to as the lifting up of my head. True strength arises through acceptance, meaning He fortifies us by receiving and cultivating fruit within us; for Ephraim signifies "bringing forth fruit." Acceptance can also relate to the moment we receive Christ; Christ, the Head of the Church, uplifts us. The perplexing expressions found in the earlier psalm are mirrored here, as when referring to our adversaries.
This psalm instructs us that titles appearing to reference history are best understood in a prophetic light, consistent with the intent behind the psalms' composition. Furthermore, this psalm integrates components from two distinct sections, each with varied titles. It signifies a convergence towards a unified purpose, not merely on a historical level but in profound prophecy, with both subjects unified under a singular title: the Song or Psalm of David. This title bears no resemblance to previous titles save for the name David. For in many instances and diverse manners, as noted in the Epistle to the Hebrews, God conveyed His word to the fathers through the prophets. Yet, He also spoke of the One He would send subsequently, fulfilling the prophetic declarations, for all the promises of God find their affirmation in Him.