The interpretation timeline
Psalm 118:90 Douay-Rheims

Thy truth unto all generations: thou hast founded the earth, and it continueth.

A.D. 373 – 1849 4 witnesses

Patristic

before A.D. 750
373
A.D.
c. A.D. 296–373
“But that the providence and ordering power of the Word also, over all and toward all, is attested by all inspired Scripture, this passage suffices to confirm our argument, where people who speak of God say, "You have laid the foundation of the earth, and it abides. The day continues according to your ordinance."”
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“But the next verse, after heaven, pertaineth consequently to earth. For this is one verse of the eight which relate to this letter. For eight verses are appended to each of these Hebrew letters, until this long Psalm be ended. "Thy truth also remaineth from one generation to the other: Thou hast laid the foundation of the earth, and it abideth" (ver. 90). Beholding therefore the earth next after heaven with the gaze of a faithful mind, he findeth in it generations which are not in heaven, and saith, "Thy truth remaineth from one generation to the other:" signifying all generations by this expression, from which the Truth of God was never absent in His saints, at one time fewer, at one time more in number, according as the times happened or shall happen to vary; or wishing two particular generations to be understood, one pertaining to the Law and the Prophets, another to the Gospel. ...”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“I am thine, save me,.... From all troubles and afflictions; from all enemies, temporal and spiritual; from Satan, and his principalities and powers, from sin, and all the wretched consequences of it; from hell wrath, and damnations: salvation from all which is by Christ. And this is a prayer of faith with respect to him, founded upon his interest and property in him; whose he was by choice, by covenant, by gift, by purchase, and by grace: and this is a plea for salvation; thou hast an interest in me, I am one of thine, therefore let me not be lost or perish; for I have sought thy precepts; to understand them better, and observe them more constantly; and which sense of interest and relation, and of salvation, will influence unto.”
Source
1849
A.D.
1774–1849
“All. Literally, “unto generation and generation,” which the fathers explain of the true faith, which has subsisted in the synagogue and in the Church of Christ alone. (St. Hilary, St. Ambrose, &c.) (Calmet) — Those who did not belong to the former, in the first ages of the world, might still form a part of the latter, like Job, &c. Without faith it is, and always was, impossible to please God, Hebrews xi. 6.”
Source
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.