Psalm 17:38, 39, 50
I will pursue after mine enemies, and overtake them. I will break them, and they shall not be able to stand: they shall fall under my feet. Therefore will I give glory to thee, O Lord, among the nations, and I will sing a psalm to thy name.
Haydock
Verse 38. I will. Bellarmine would supply “I said I will;” and thus all is connected. But these future victories relate more to Jesus Christ. Bert. — David also continued making fresh conquests, (H.) and so entirely subdued his enemies all around, that they were not able to make head, even against his successor.
Verse 50. Nations. S. Paul (Rom. xv. 9.) adduces this to prove the vocation of the Gentiles. C. — We cannot doubt but the great things announced in the psalm pertain to Christ. Bert. — We see the completion of this prophecy, as there is no Christian nation which does not use the psalms of David to praise God. Theod. &c. — This practice is very common (Pref. W.) in all places here either Jews or Christians are found.
Denzinger
2133: The Authors and the Time of the Composition of the Psalms
Reply of the Biblical Commission, May 1, 1910
Question V: Whether in appearance the Davidian origin can be denied to those psalms which are cited in the Old and New Testament distinctly under the name of David, among which to be considered before the rest come: psalm 2, Quare fremuerunt gentes; psalm 15, Conserva me, Domine; psalm 17 Diligam te, Domine, fortitudo mea; psalm 31, Beati, Quorum remissae sunt iniquitates; psalm 68, Salvum me fac, Deus; psalm 109, Dixit Dominus Domino meo?–Reply: In the negative.