The interpretation timeline
Psalm 118:91 Douay-Rheims

By thy ordinance the day goeth on: for all things serve thee.

A.D. 373 – 1849 5 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."”
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“If we are to believe this [that God knows the past, present and future] about the ages, much more must we believe it about the day of judgment, on the ground that the Son of God has knowledge of it, as being already made by him. For it is written, "According to your ordinance the day will continue." He did not merely say "the day continues" but even "will continue," so that the things that are to come might be governed by his ordinance. Does he not know what he ordered? "He who planted the ear, shall he not hear? He who formed the eye, shall he not see?"”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“"Day continues according to Your ordinance" [Psalm 119:91]. For all these things are day: "and this is the day which the Lord has made: let us rejoice and be glad in it:" and "let us walk honestly as in the day." [Romans 13:13] "For all things serve You." He said all things of some: "all" which belong to this day "serve You." For the ungodly of whom it is said, "I have compared your mother unto the night," do not serve You.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“The wicked have waited for me to destroy me,.... This is another reason why he desires the Lord would save him; because wicked men, such who feared not God, nor regarded men, sons of Belial; such as Saul's courtiers and the conspirators with Absalom were, had laid wait and were waiting an opportunity, and were hoping and expecting to have one, that they might take away his life; destroy him out of the world, as Kimchi; or eternally, as Aben Ezra thinks; by endeavouring to draw him out of the right ways of religion and godliness, into the ways of sin and wickedness, and so ruin him for ever; but I will consider thy testimonies; the word of God, which testified of his power and providence, employed in the protection of his people, and so an encouragement to put trust and confidence in him; and of his mind and will, with respect to the way in which he should walk; and so making these his counsellors, as he did, Psa 119:24; and well weighing and considering in his mind what they dictated to him, he was preserved from the attempts of his enemies to destroy him, either temporally or spiritually.”
Source
1849
A.D.
1774–1849
“Serve thee. Except man, (Worthington) and angels who rebel; and yet they also are forced to serve as victims of justice, if they have refused to accept of mercy. (Haydock)”
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.