The interpretation timeline
Psalm 137:6 Douay-Rheims

For the Lord is high, and looketh on the low: and the high he knoweth afar off.

A.D. 430 – 1849 4 witnesses 6 excerpts

Patristic

before A.D. 750
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“See how he willed that kings should sing on their way, humbly bearing the Lord, not lifting themselves up against the Lord. For if they lift themselves up, what follows? "For the Lord is high, and has respect unto the lowly" [Psalm 138:6]. Do kings then desire that He have respect unto them? Let them be humble. What then? If they lift themselves up to pride, can they escape His eyes? Lest perchance, because you have heard, "He has respect unto the lowly," thou choose to be proud, and say in your soul, God has respect unto the lowly, He has not respect unto me, I will do what I will. O foolish one! Would you say this, if you knew what you ought to love? Behold, even if God wills not to see you, do you not fear this very thing, that He wills not to see you?...The lofty then, it seems, He has not respect unto, for it is the lowly He respects. "The lofty"— what? "He considers from afar." What then gains the proud? To be seen from afar, not to escape being seen. And think not that you must needs be safe on that account, for that He sees less clearly, who sees you from afar. For thou indeed see not clearly, what you see from afar; God, although He see you from afar, sees you perfectly, yet is He not with you. This you gain, not that you are less perfectly seen, but that you are not with Him by whom you are seen. But what does the lowly gain? "The Lord is near unto them that are of a contrite heart." Let the proud then lift himself up as much as he will, certainly God dwells on high, God is in heaven: do you wish that He come near to you? Humble yourself. For the higher will He be above you, the more you lift yourself up.”
Source
“Perhaps because [the psalm] said, "The Lord is sublime and observes lowly things," you say to yourself, "Then he does not observe me." What could be more unfortunate than you, if he does not observe you but ignores you? Observing indicates compassion; ignoring indicates contempt. But no doubt, because the Lord observes lowly things, you imagine you escape his notice, because you are not humble or lowly, you are high and mighty, you are proud. That is not the way to be missed by the eyes of God. I mean, just see what it says there: "The Lord is sublime." Sublime indeed. How are you going to get to him? Will you look for a ladder? Look for the wood of humility, and you have already gotten to him. "The Lord is sublime, he observes lowly things, but high and mighty things" (do not imagine you escape notice, you that are so proud) "but high and mighty things he knows from afar." He knows them, all right, but from afar. "Salvation is far from sinners."”
Source
“We have heard, and it is clear; we had gone outside, we have been sent within. "O would that I had found," you said, "some high and lonely mountain! For, I believe, because God is on high, he hears me from a high place." Because you are on a mountain, do you think that you are near God and that you are heard quickly, as if shouting from nearby? He dwells on high, but "he looks on the lowly." "The Lord is near." To whom? Perhaps to the high? "To those who are contrite of heart." It is a wondrous thing: he both lives on high and draws near to the lowly. "He looks on the lowly, but the high he knows from afar." He sees the proud from afar; the higher they seem to themselves, so much of the less does he approach them.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“He chastises Heb. יידע, chastises, like (Jud. 8:16): “and with them he broke (ויודע) the men of Succoth.””

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Though the Lord be high,.... Above all the earth, and all the nations of it, and the highest of men in it; above the heavens, and the angels there, who are his creatures and at his command; above all the blessings and praises of his saints: the perfect knowledge of him is so high as not to be attained; and his thoughts and ways are higher than ours, as the heavens are higher than the earth; he is indeed the most High, higher than the highest; see Psa 113:4. According to Arama, here begins the song, "the kings of the earth shall sing in the ways of the Lord?'' yet hath he respect unto the lowly; for good, as the Targum; that are low in their own eyes, humbled under a sense of sin, convinced, of the insufficiency of their own righteousness to justify them, and made to submit to the righteousness of Christ; ascribe the whole of their salvation to the free grace of God; patiently and quietly bear every afflictive providence; think the worst of themselves, and the best of others; and, being the followers of the lowly Jesus, learn of him, imitate him, and become like unto him: these the Lord has a gracious respect unto; he looks upon them with a look of love; he has respect to their persons in Christ, and to their sacrifices for his sake, which are those of a broken and contrite heart; he regards their prayers, though low and destitute, and gives more grace unto them; yea, he condescends to dwell with them, and in due time highly exalts them; see Isa 57:15. David may have in view his own low state and condition as a shepherd, in which he was when the Lord took him, and raised him to the throne of Israel; but the proud he knoweth afar off; the Targum adds, "to destroy them:'' such who are proud of themselves and what they have; of their wisdom and knowledge, of their strength or beauty, of their wealth and riches; or of their righteousness and holiness; of the purity and goodness of their hearts, and power of their free will, they vainly think themselves possessed of; and despise others below them in these things, or the practice of them: these the Lord takes notice of, and looks upon them at a distance with scorn and contempt; nor will he admit them to nearness to him, nay, opposes himself to them, and sooner or later abases them; see Pro 3:34. The Septuagint and Vulgate Latin versions render it, "high things he knoweth afar off"; things too high for creatures, that are out of their reach; he sees and knows all persons and things, whether in heaven or in earth. Others render them, "and the high One knoweth afar off" (u); knows the lowly, owns and acknowledges them for his own; takes care of them, provides for them, and protects them: and then the sense is the same with the preceding clause. (u) So Pagninus; "quamvis", Junius & Tremellius.”
Source
1849
A.D.
1774–1849
“The high, &c. The proud and haughty, who exalt themselves , God knoweth afar off; that is, he despiseth them, and setteth them at a distance from him; whilst he stoopeth down to favour and embrace the low and humble. (Challoner) — He treats the proud as strangers to him. (Worthington) — If kings would sing in the ways of the Lord, they also must love, and be humble. (St. Augustine) — God knows all things before they happen, (St. Chrysostom) and both high and low are equally open to his eye, Psalm cxii. 5., and cxxxviii. 2., and 8. (Calmet)”
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.