The interpretation timeline
Psalm 97:2 Douay-Rheims

The Lord hath made known his salvation: he hath revealed his justice in the sight of the Gentiles.

A.D. 339 – 1849 4 witnesses

Patristic

before A.D. 750
339
A.D.
c. A.D. 260–339
“Along with my prayers I now add book 10 to the Church History and dedicate it to you, my most consecrated Paulinus, and blazon you as the seal of the whole work. It is appropriate that in a perfect number I shall here provide a completed account in celebration of the restoration of the churches, in obedience to the divine Spirit who urges us: Sing to the Lord a new song, for he has done marvelous things; His right and his holy arm have wrought salvation for him. The Lord has made known his salvation: His righteousness he has revealed in the sight of the heathen. Accordingly, let me now sing the new song, since after those grim and horrifying scenes and narratives, I was now privileged to see and to celebrate what many righteous people and martyrs of God before me desired to see but did not see and to hear but did not hear. But they hurried on to far better things in the heavens, caught up into a paradise of divine bliss, while I, admitting that even the present circumstances are more than I deserve, have been totally astonished at the magnitude of grace he has conferred and offer him my total awe and worship, confirming the truth of the prophecies that declare: Come and behold the works of the Lord, What wonders he has wrought on the earth, Making wars to cease to the ends of the world. He will break the bow and shatter the spear, And the shields he will burn with fire. Rejoicing that all this has been clearly fulfilled, let me proceed with my narrative.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“"The Lord has made known His salvation" [Psalm 98:2]. This very right hand, this very arm, this very salvation, is our Lord Jesus Christ of whom it is said, "And all flesh shall see the salvation of God;" [Luke 3:6] of whom also that Simeon who embraced the Infant in his arms, spoke, "Lord, now let Your servant depart in peace; for my eyes have seen Your salvation." [Luke 2:28-30] "The Lord has made known His salvation." To whom did He make it known? To a part, or to the whole? Not to any part specially. Let no man betray, no man deceive, no man say, "Lo, here is Christ, or there:" [Matthew 24:23] the man who says, Lo, He is here, or there, points to some particular spots. To whom "has the Lord declared His salvation"? Hear what follows: "His righteousness has He openly showed in the sight of the heathen." Our Lord and Saviour Jesus Christ is the right hand of God, the arm of God, the salvation of God, and the righteousness of God.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“The Lord hath made known his salvation,.... Which was appointed him, he undertook, came to perform, and has effected; this, though wrought out, is unknown to men, especially to the Gentile world, who had no prophecy, promise, or revelation of the Messiah, and salvation by him; but now this is made known in the everlasting Gospel, called therefore the Gospel of salvation, and by the ministers of it; and, besides this, the spirit of wisdom and revelation in the knowledge of Christ, and his salvation, is given to some; whereby they come to know their need of it, the suitableness of it to their case, the necessity of going to Christ for it, and their special and particular interest in it; and such have a new song put into their mouths, and are under great obligation to sing it: his righteousness hath he openly showed in the sight of the Heathen; either the faithfulness of God in fulfilling his promises, particularly in raising up the Saviour Jesus; or the goodness of God to his people, and the strictness of his justice on their surety; goodness towards them, and severity on him, when he spared them and not him, turned his hand of grace and mercy on them, when he awoke the sword of justice against him; or rather his own righteousness, by which he fulfilled the law in the room and stead of his people; and which being brought in is revealed in the gospel, from faith to faith; and that "openly", not in dark shadows, types, and figures; but it is to be seen with open face in the clear glass of the Gospel; and is held up and forth in the ministration of it unto the Gentiles, whom God justifies through faith in it, as well as the believing Jews; see Rom 3:30.”
Source
1849
A.D.
1774–1849
“Salvation. Cyrus, or the Messias, whose gospel is preached every where, (Calmet) and who has saved the world. (Worthington)”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.