From the early Church Fathers to now.
5 Patristic · 2 Jewish · 1 Medieval · 1 Catholic
“From them that resist thy right hand keep me, as the apple of thy eye. Protect me under the shadow of thy wings.”
“The written words say that God has wings.… But we will not on that account say that God's spiritual and indestructible essence is winged.… What, then, are we to understand by the wings? The help, security, shelter, defense and unconquerable aid that God gives us.”
“"Keep Me, O Lord, as the apple of Your eye": which seems very little and minute: yet by it is the sight of the eye directed, whereby the light is distinguished from the darkness; as by Christ's humanity, the divinity of the Judgment distinguishing between the righteous and sinners. "In the covering of Your wings protect Me." In the defence of Your love and mercy protect Me.”
“His prayer is to enjoy such protection as does the apple of the eye, which has eyelids as a kind of rampart and eyelashes for a palisade; it also has eyebrows as mounds, conducting the stream of sweat to the temples and warding off from the faculty of sight any harm from that source.”
“This should be the careful consideration of wise people, that since the days of this life are short and the time uncertain, death should never be unexpected for those who are to die. Those who know that they are mortal should not come to an unprepared end. Therefore this, which has been proclaimed by the voice of the prophet, should be taken up in the hearts of those praying, so that it may be said, not with the lips only but also with the heart.… For we are always in need of divine help. This is the unconquerable courage of human devotion, that we always have a protector without whom we are not able to be brave.”
“The Father's protection is compared to wings. Mercy and love are, so to speak, the wings of the Father with which he asks to be protected. This comparison is drawn from the example of birds who guard their own dear offspring by spreading out their wings.”
“as the apple Heb. (כאישון). That is the pupil (lit. the black) of the eye, on which the vision depends. Because it is black, it is called אישון, an expression of darkness, and the Holy One, blessed be He, prepared a guard for it, viz. the eyelids, which constantly cover it.”
“Keep me as the pupil (אישׁון) of the ball of the eye: – as a man guards the pupil of his eye – that is, the black part through which the light (passes). It is called the אישׁון (lit. little man), because the image of a man is seen in it; and the waw and nun mark the diminutive, because the image is diminutive; so also the ון of שׁבתון (sabbath keeping), with the idea of emphasising its holiness. So also, with the addition of yodh, אמינון in 2 Sam. 13:20. אישון is in the construct before בת, and (with it) forms one expression; בת (lit. daughter) is a substantive, (denoting) the eyeball through which the light (passes), while pupil is a descriptive term because the image of a man is seen in it. And hide me in the shadow of Thy wings, –”
“A saint's life must be pure, that is, everything must be done out of love for God, and not out of love for something else, since all love is suspect if it is not addressed to God. "Keep me as the apple of your eye." The apple of the eye is not kept clean when there is mist or dust or liquid on it.”
“Next he sets forth the manner of deliverance, which is diligently and safely; therefore he says, "Guard me as the pupil of the eye." The pupil of the eye is guarded with diligence, because nothing that could harm it is permitted to approach; so also God does in guarding his servant: Deut. 32: "He led him about and taught him and guarded him as the pupil of his eye." Zech. 2: "He who touches you touches the pupil of my eye." Or according to the Gloss, the pupil of the eye is said to be Christ, who directs: Sir. 3 says the power of sight is in the pupil, by which we discern good from evil; and Christ discerns the faithful from the unfaithful and the evil from the good. To manifest this diligent guarding, he uses a twofold metaphor: namely, of shadow and of wings. For shadow refreshes from the heat, and so also the protection of God refreshes, giving security. Likewise, with her wings the hen guards her chicks against the hawk; so also God, with his wings, which are charity and mercy, defends the just from the rapacity of demons. Mt. 23: "How often I wished to gather you, as a hen gathers her chicks under her wings, and you would not!" With these wings, therefore, God lifts us to heavenly things: Ps. 88: "Mercy and truth shall go before your face; blessed is the people," etc. Jer. 31: "With everlasting love I have loved you; therefore I have drawn you, having mercy." Or the pupil of the eye is said to be the soul, because just as the pupil, which is in the middle of the eye, is surrounded by many membranes for its defense, and a man puts forth his hand and nearly everything he has lest it be harmed, so a man ought to do for his soul: Job 2: "Skin for skin," etc., because, as Mk. 8 says, "What does it profit a man if he gains the whole world and loses his soul?" etc. Or "Guard me as the pupil of the eye," that is, as Christ; "protect me under the shadow of your wings," that is, under the guardianship of the angels: Ps. 90: "He has given his angels charge over you," etc. Or the two wings are the two arms of Christ extended on the cross: Deut. 32: "He spread his wings and took them up and carried them on his shoulders."”
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.