The interpretation timeline
Genesis 21:19 Douay-Rheims

And God opened her eyes: and she saw a well of water, and went and filled the bottle, and gave the boy to drink.

A.D. 407 – 1871 4 witnesses 5 excerpts

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“"He opened her eyes," the text goes on, not because she couldn't see before this but because even with her eyes open nothing was of any help to her before the visitation from on high. Hence, since his intention was to give evidence of care on his part, it says, "He opened her eyes," that is, he made clear to her in her ignorance, he activated her mind, he showed her the way to find the place flowing with springs of water. "She saw a well of running water," the text goes on, "and she went and filled the bag, and gave the boy to drink." In her neediness the Lord granted her means, and when she found herself so much at a loss and lacking all hope of survival, he gave evidence in her case of his characteristic generosity by consoling her and at the same time exercising care for the child.In like manner, whenever God wishes, even if we are utterly alone, even if we are in desperate trouble, even if we have no hope of survival, we need no other assistance, since God's grace is all we require. You see, if we win favor from him, no one will get the better of us, but rather we will prevail against anyone. "God was with the boy," the text goes on; "he grew up and lived in the desert." In similar fashion, whenever we have God on our side, even if we are utterly alone, we will live more securely than those who dwell in the cities. After all, the grace of God is the greatest security and the most impregnable fortification.”
Source
“Mindful of this, let us, I beseech you, shun the harm of this passion and with all our might exterminate it from our own souls. This, after all, is more deadly than all other passions and undermines our very salvation, being in fact the invention of the wicked demon. Hence a certain sage also said, "Through the devil's envy death entered the world." What is meant by "through the devil's envy death entered the world"?You see, since this wicked beast saw that the first-formed human being was created immortal, by his characteristic wickedness he led him on to disobedience of the command and in that way caused him to bring on himself the penalty of death. So envy caused deception, deception caused disobedience, and disobedience caused death. Hence the text says, "Through the devil's envy death entered the world." Do you see the extent of the harm caused by this passion? It made the one given the privilege of immortality undergo death. The enemy of our salvation, however, introduced the envy characteristic of himself and caused the first-formed human being, immortal though he was, to come under sentence of death, whereas the caring and loving Lord by his own death once again bestowed upon us immortality, and so we found greater benefits than we had lost. The former took us out of paradise; the latter led us into heaven. The former caused us to be condemned to death; the latter bestowed upon us immortality. The former deprived us of the delights of paradise; the latter prepared for us the kingdom of heaven. Do you see the inventiveness of your Lord in that he directed against the devil's head his own weapons of malice against our salvation? In fact, not only did he regale us with greater benefits, but also he made him subject to us in the words "Behold, I have given you power to walk over snakes and scorpions." Accordingly, keeping all this in mind, let us banish envy from our own souls and win favor from God. This, after all, is our invincible weapon; this, our greatest resource. Hence Ishmael too, young though he was and in utter isolation and neediness, suddenly grew in strength and developed into a great nation since, the text says, "God was with the child." … Let us therefore, I beseech you, despise this present life, long for the future life, esteem favor from God above all other things, and, through an excellent way of living, lay up for ourselves great confidence, so that we may be able to pass this present life without distress and attain those future blessings, thanks to the grace and loving kindness of our Lord Jesus Christ, to whom with the Father and the Holy Spirit be glory, power and honor, now and forever, for ages of ages. Amen.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And God was with the lad,.... To confirm his health, to provide for him the necessaries of life, to protect him from danger in the wilderness where he was, and to prosper and succeed him in temporal things; all which is owing to the providential goodness of God: and he grew; increased in bodily stature, and arrived to manhood; or, "he became great", in riches and in substance, as Ben Melech interprets it: and dwelt in the wilderness; of Beersheba, where he now was, or of Paran after mentioned, a fit place for a wild man to dwell in, as it was said he should be; and by this means the oracle was fulfilled, Gen 16:12, and became an archer; skilful in the use of the bow and arrow, both for hunting and slaying of wild beasts, on whose flesh he lived, and for lighting with men, against whom his hand would be: the Jewish writers (l) say he was born with a bow, and brought up with one, and that he shot an arrow at his brother Isaac, with an intention to kill him, while he was in Abraham's house; but it does not appear that he had any knowledge or use of the bow until he was in the wilderness and was grown up, by which he lived and defended himself; and so his posterity the Kedarenes, who sprung from his son Kedar, were famous for archery, Isa 21:17; and the Ituraeans, from Jetur, another of his sons, Gen 25:15, were remarkable for their bows, of which Virgil (m) speaks; and so the Arabians that live in the deserts and round about them, called Nabathees, from Nabaioth, another son of Ishmael, are now extraordinary marksmen for bows and arrows, and to sling darts which are made of cane (n): the Saracens got their living not by the plough, but chiefly by the bow, and were all of them warriors, and lived upon wild flesh, and as rapacious as kites (o); and now the troops of the governor of Mecca, whereabout Ishmael, by the Arabs, is supposed to live, which are only infantry, are called Al-Harrabah, that is, archers, or dart men (p). (l) Pirke, c. 30. Ammian. Marcellin. Hist. l. 14. (m) "Ithyraeos taxi curvantur in arcus". Georgic. l. 2. ver. 448. (n) Rauwolff's Travels, par. 2. ch. 4. p. 118. by Ray. (o) Ammian. Marcellin. l. 14. p. 8. Ed. Vales. (p) Sharif al Edrisi, apud Pocock. Specim. Arab. Hist. p. 122, 124.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“God opened her eyes - These words appear to me to mean no more than that God directed her to a well, which probably was at no great distance from the place in which she then was; and therefore she is commanded, Gen 21:18, to support the lad, literally, to make her hand strong in his behalf - namely, that he might reach the well and quench his thirst.”
Source
1871
A.D.
1871
“God opened her eyes--Had she forgotten the promise (Gen 16:11)? Whether she looked to God or not, He regarded her and directed her to a fountain close beside her, but probably hid amid brushwood, by the waters of which her almost expiring son was revived.”
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.