The interpretation timeline
Matthew 3:17 Douay-Rheims

And behold a voice from heaven, saying: This is my beloved Son, in whom I am well pleased.

A.D. 367 – 1871 11 witnesses 15 excerpts

Patristic

before A.D. 750
367
A.D.
Hilary of Poitiers Patristic
c. A.D. 310–367
“Or, that from these things thus fulfilled upon Christ, we might learn that after the washing of water the Holy Spirit also descends on us from the heavenly gates, on us also is shed an unction of heavenly glory, and an adoption to be the sons of God, pronounced by the Father’s voice.”
“(de Trin. iii. 11.) He witnesses that He is His Son not in name merely, but in very kindred. Sons of God are we many of us; but not as He is a Son, a proper and true Son, in verity, not in estimation, by birth, not adoption.”
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“(Ambrosiaster. Serm. x. 1.) And no wonder that the mystery of the Trinity is not wanting to the Lord’s laver, when even our laver contains the sacrament of the Trinity. The Lord willed to shew in His own case what He was after to ordain for men.”
420
A.D.
Jerome Patristic
c. A.D. 347–420
“The mystery of the Trinity is shewn in this baptism. The Lord is baptized; the Spirit descends in shape of a dove; the voice of the Father is heard giving testimony to the Son.”
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“(non occ.) Not as before by Moses and the Prophets, neither in type or figure did the Father teach that the Son should come, but openly shewed Him to be already come, This is my Son.”
“(de Trin. iv. 21.) Here are deeds of the whole Trinity. In their own substance indeed Father, Son, and Holy Spirit are One without interval of either place or time; but in my mouth they are three separate words, and cannot be pronounced at the same time, and in written letters they fill each their several places. By this comparison may be understood how the Trinity in Itself indivisible may be manifested dividedly in the likeness of a visible creation. That the voice is that of the Father only is manifest from the words, This is my Son.”
Source
“(in Joann. tr. 14. 11.) The Father loves the Son, but as a father should, not as a master may love a servant; and that as an own Son, not an adopted; therefore He adds, in whom I am well-pleased.”
“(de Cons. Ev. ii. 14.) These words Mark and Luke give in the same way; in the words of the voice that came from Heaven, their expression varies though the sense is the same. For both the words as Matthew gives them, This is my beloved Son, and as the other two, Thou art my beloved Son, express the same sense in the speaker; (and the heavenly voice, no doubt, uttered one of these,) but one shews an intention of addressing the testimony thus borne to the Son to those who stood by; the other of addressing it to Himself, as if speaking to Christ He had said, This is my Son. Not that Christ was taught what He knew before, but they who stood by heard it, for whose sake the voice came. Again, when one says, in whom I am well-pleased; another, in thee it hath pleased me, if you ask which of these was actually pronounced by that voice; take which you will, only remembering that those who have not related the same words as were spoken have related the same sense. That God is well-pleased with His Son is signified in the first; that the Father is by the Son pleased with men is conveyed in the second form, in thee it hath well-pleased me. Or you may understand this to have been the one meaning of all the Evangelists, In Thee have I put My good pleasure, i. e. to fulfil all My purpose.”
Source

Medieval

c. 750 – 1100
908
A.D.
c. A.D. 841–908
“Or if it be referred to the human nature of Christ, the sense is, I am pleased in Him, whom alone I have found without sin. Or according to another reading, It hath pleased me to appoint Him, by whom to perform those things I would perform, i. e. the redemption of the human race.”

Scholastic

c. 1100 – 1500
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“Above, the Evangelist introduced John baptizing; now he introduces Christ coming to the baptism of John. And concerning this he does two things. First he sets down the things that preceded the baptism; second, the things that followed upon the baptism, at the words but Jesus, having been baptized. Concerning the first, four things are set down. First, Christ's wondrous humility; second, the admiration at that humility; third, Christ's satisfaction given to that admiration; fourth, John's consent to that satisfaction. The second is at but John was preventing him; the third at but Jesus, answering; the fourth at then he permitted him. Concerning the first, four things are set down: the time, the persons, the places, and the office. The time, when he says then, namely, while John still had his own light. For just as the sun rises while Lucifer still appears, so did Christ while John was preaching and baptizing, Luke 3:21. Job 38:32: "Canst thou bring forth Lucifer in its time, and make the evening star to rise upon the children of the earth?" Or then, when Christ was in his thirtieth year, Luke 3:23, so as to give one to understand that no one ought to take up the office of preaching and of prelacy before a mature age. Or then, when according to the course of others he could have committed many sins. Hence he did not wish to be baptized at once, but for a long time kept the law, as one placed under the law, and so that the Jews might have no occasion for scandal, since he did not come to dissolve the law, below 5:17. But it might seem to someone that Christ delayed being baptized because he could not have fulfilled the law; and this is why he wished to observe it for so long, and why he was not baptized so quickly. The persons are set down when it is said Jesus came to John — the Lord to the servant, the Creator to the creature; below 11:29: "Learn from me, because I am meek and humble of heart." The places, from Galilee. These things agree mystically with the baptized, because Galilee signifies a passing-over: for it is fitting that the baptized pass over from vices to virtues; 1 Peter 2:1: "Laying away all malice, and all guile, and dissimulations, and envies, and all detractions." Likewise, into the Jordan. Jordan is interpreted as descent, and signifies the humility that ought to be present in the one being baptized so that grace may be received; James 4:6: "But to the humble he giveth grace." The office is set down, that he might be baptized. God willed to be baptized by John for four reasons. First, so that the baptism of John might be preserved in honor, because some were disparaging it, below 21:24. Second, so that by his touch he might consecrate all water; and therefore baptism is said to be made from the fountains of the savior; Isaiah 12:3: "You shall draw waters with joy out of the saviour's fountains." Third, so that he might demonstrate in himself the true condition of man, because just as he was in the likeness of sinful flesh, Romans 8:3, so he willed to be cleansed as though a sinner. Fourth, so that he might impose upon others the necessity of being baptized: for he wished first to keep what he imposed; Acts 1:1: "Jesus began to do and to teach," against those of whom it is said below, 23:4: "They bind heavy and insupportable burdens, and lay them on men's shoulders: but with a finger of their own they will not move them." Next the admiration is set down. And note three things. For first John refuses the honor offered to him; second he confesses his own humility; third his own weakness. The second is at but John was preventing him; Ecclesiasticus 7:4: "Seek not of man the leadership, nor of a king the seat of honor." The third is at I ought to be baptized by thee. For he knew that Christ baptized inwardly; and therefore he speaks of being baptized, that is, cleansed from original sin — so says the Gloss. But against this, one might object, since John was sanctified in the womb. But it must be said that before the coming of Christ some were in a certain way cleansed as to the infection of the person, through circumcision and the like; but as to guilt and the infection of the whole nature, no one was cleansed before the passion of Christ. And comest thou to me? Psalm 138:6: "Thy knowledge is become wonderful to me: it is high, and I cannot reach to it." Next Christ's satisfaction is set down. Note that John had done one thing, in that he was preventing him; and he had said two things: I ought to be baptized by thee, and comest thou to me? And yet Christ did not answer to the one, namely to this: I by thee; but he answered to that which he was preventing, whence: suffer it to be so now. And he says now, because, according to Chrysostom, John was afterward baptized by Christ, not only with the baptism of the spirit, but also of water. Or suffer it to be so now, he says this because John was afterward baptized with the baptism of the Holy Spirit. Or suffer it to be so now, that I may be baptized with the baptism of water, because I have another baptism with which to be baptized, namely the baptism of the passion; Luke 12:50: "I have a baptism wherewith I am to be baptized: and how am I straitened until it be accomplished?" And with this baptism too John was baptized by Christ, inasmuch as he died for justice, which is the same as to die for Christ. Or suffer it to be so now, meaning: while I bear the form of a servant, let me fulfill the office of humility; because when I shall appear glorious, then I will baptize thee with the baptism of glory. Next Christ answers the admiration, and says thus: for so it becometh us to fulfil all justice. Which is expounded in three ways. First, thus it becometh us to fulfil all justice, namely through baptism: for it was to come to pass that Christ would fulfill all justice, both of the law and of nature; but he willed to fulfill it by this way, because without baptism it is not fulfilled; John 3:3: "Unless a man be born again, he cannot see the kingdom of God," etc. Remigius expounds it thus: thus it becometh us to fulfil all justice — it becomes me to give an example of this sacrament, in which the fullness of all justice is given, because the fullness of grace and of the other virtues is given; Psalm 64:10: "The river of God is filled with water," namely of graces. Or thus: thus it becometh us etc., that is, it becomes me to have perfect humility. The first degree is not to prefer oneself to an equal, and to subject oneself to a greater, which indeed is a matter of necessity. The second, when one subjects oneself to an equal. But the perfect degree is when a superior subjects himself to an inferior: and this is thus it becometh us etc., that is, to fulfill perfect humility. But since there was such a contest of wills between them, Christ prevailed. Hence then he permitted him, etc., that is, he permitted that he be baptized by him. The Gloss: true humility is that which obedience does not forsake; for to resist stubbornly belongs to pride. 1 Kings 15:23: "As the sin of witchcraft, is to rebel," that is, to refuse to acquiesce; for thus are Jeremiah and Moses praised, who in the end gave their consent. Next, when it says but Jesus, having been baptized, forthwith came out of the water, four things consequent upon the baptism are set down. And it should be known that just as Christ in his own baptism gave an example of baptizing for others, so in the things following upon the baptism he gave us to understand what we should follow after. Now there are four consequent things, namely the ascent of Christ, the opening of heaven, the appearance of the Holy Spirit, and the declaration of the Father. The first is at but Jesus, having been baptized, forthwith came out of the water. And to the letter this is said because the river had deep channels. In this, however, it is signified that those who are baptized ascend by good works. And he says forthwith, because those baptized immediately put on Christ in Christ; Galatians 3:27: "For as many of you as have been baptized in Christ, have put on Christ." Likewise they obtain a heavenly inheritance; 1 Peter 1:3: "He hath regenerated us unto a lively hope... unto an inheritance incorruptible": and this is and the heavens were opened. This is not to be understood corporeally, but by an imaginary vision. And the heavens were opened to him. And this signifies that heaven had been closed to the human race through sin; Genesis 3:24: "And he placed before the paradise of pleasure Cherubims, and a flaming sword, turning every way, to keep the way of the tree of life." It is said that he placed the Seraphim, but it was opened through Christ. But it is asked, why were the heavens opened to him, since they had always been open to him? And it must be said, according to Chrysostom, that the Evangelist speaks according to the common manner of speaking, because by the merit of his baptism the heavens were opened to us: just as a king, when a friend of his asks a favor on behalf of another, says: I grant this to you. And it should be known that there are three kinds of men who fly straight to heaven immediately after death: those baptized, as here; martyrs, whence Acts 7:56: "Behold, I see the heavens opened, and the Son of man standing on the right hand of God"; and those who have completed penance, of whom it is said, Acts 10:19, that to Peter praying heaven was opened. Next the appearance of the Holy Spirit is set down; hence: and he saw the Spirit of God descending as a dove, and coming upon him. This is what is fitting for the baptized, who receive the Holy Spirit into themselves; John 3:6: "That which is born of the Spirit, is spirit," that is, is spiritual. And he saw — not by an imaginary vision, otherwise he alone would have seen it — the Spirit of God, that is, the dove. And it should be known that nothing corporeal is said of God according to his substance, but either through an imaginary vision, Isaiah 6:1: "I saw the Lord sitting upon a throne high and elevated," etc., or through signification, 1 Corinthians 10:4: "And the rock was Christ," or through assumption into the unity of the person, John 1:14: "The Word was made flesh." But in none of these ways is the Holy Spirit called a dove. That it is not by an imaginary vision is clear, because it was seen commonly by all. Not by signification, because it had not previously existed as such. Not by assumption into the unity of the person. And therefore there is a fourth way, which is when some species is newly formed for the representation of divine effects, as in Exodus 3:2 the Lord appeared in fire and a bush; and in the giving of the law, in lightning and thunder, Exodus 19:16. Hence the dove served to represent the influence of the Holy Spirit: and this is and he saw the Spirit of God descending. Now he appeared in the form of a dove for four reasons. First, on account of charity; for the dove is a loving animal. Chrysostom: "Even the servant of the devil has, in pretense, other gifts which the servant of God has in truth: only the charity of the Holy Spirit can the unclean spirit not imitate." Song of Songs 5:2: "Open to me, my sister, my love, my dove, my undefiled." Second, on account of innocence and simplicity; below 10:16: "Be ye therefore wise as serpents, and simple as doves." Third, because it has a moaning in place of song; and man, sanctified through the Holy Spirit, ought to groan for his sins; Nahum 2:7: "And her handmaids led her away mourning, as doves." Fourth, on account of fecundity. Whence also it was commanded in the law that they should offer a dove: and this befits the baptized, because, as John 3:6 says, "that which is born of the Spirit, is spirit." Descending as a dove. The emanation of divine gifts from God into any creature whatsoever is always by way of descent, because a creature cannot receive except by a descent into it; James 1:17: "Every best gift, and every perfect gift, is from above, coming down from the Father of lights." And coming upon him. Note: a visible mission is always a sign of an invisible mission, and it signifies either grace newly received or an increase of grace: just as in the apostles, when the Holy Spirit appeared in tongues, it signified an increase of grace. Likewise such a mission signifies either grace then made, or grace made before. In Christ, however, it did not signify a new effect, because from the instant of his conception he was full of grace and truth; but the grace which then rested upon him was so inasmuch as he was man, not inasmuch as he was God. Next, when it says and behold a voice from heaven, saying, the declaration of the Father is set down: this is my beloved Son. Note that baptism makes men not only spiritual, but also sons of God; John 1:12: "He gave them power to be made the sons of God." And it should be known that this voice, as it were, expresses that which the dove signified. Beloved — not as other creatures are, Wisdom 2:13, but as a natural son; John 5:20: "For the Father loveth the Son, and sheweth him all things which himself doth: and greater works than these will he shew him, that you may wonder." This is also signified by Psalm 2:7: "The Lord hath said to me: Thou art my son, this day have I begotten thee." But because the saints too are loved by him, he adds Son, by which he distinguishes the Son, according to one understanding, from the others. In whom I am well pleased. For in whomever the good of someone shines forth, in that one something is pleasing to himself, just as a craftsman is pleased with himself in his own beautiful work, and as when a man sees his own beautiful image in a mirror. The divine goodness is present in every particular creature; but it is never wholly perfect except in the Son and the Holy Spirit; and therefore the whole is not pleasing to himself except in the Son, who has as much of goodness as the Father: and this is in whom, that is, I am well pleased in myself in him; John 3:35: "The Father loveth the Son: and he hath given all things into his hand." But note that a certain contrariety seems to exist between this Evangelist and the others, because Mark 1:11 and Luke 3:22 say, "Thou art my beloved son"; but Matthew says, "This is my beloved son," and, "in whom." But the meaning is the same, because what is said, thou art, seemed to be said directly to Christ; but he said it on account of others, because Christ was certain of the Father's love. And therefore Matthew expressed the intention of the one speaking, and says this is, etc. Hence he shows it to have been said, as it were, to others; thus said Augustine. Likewise it is asked, why do Matthew and Mark say in whom I am, while Luke says in thee? Augustine says that the Father is pleased in the Son both in himself and for the sake of men. On account of this, therefore, what is said, in whom, signifies that he is pleased in men. Hence, that he may please others through me, that is, to my honor, because some, seeing the Son, glorified the Father. Or according to both senses: in whom I am well pleased, that is, my pleasure was to fulfill the salvation of men: and this is in thee, that is, through thee. And note that in this baptism there is represented not only the end and the fruit, but also the form of baptism, which is, in the name of the Father, and of the Son, and of the Holy Spirit, below. For the Son was in the flesh, the Father in the voice, the Holy Spirit in the form of a dove. And note that this — that they occurred separately — does not pertain to a division of the operation of the persons of the Trinity, since, just as there is a common essence, so too there is a common operation; but this is said on account of a certain appropriation, because the whole Trinity both created that dove and created the flesh; but these things are referred to the different persons.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And lo, a voice from heaven, saying,.... At the same time the heavens were opened, and the Spirit of God descended as a dove, and lighted on Christ, and whilst it abode upon him, an extraordinary voice was heard; hence the note of attention and admiration, "lo", is prefixed unto it, as before, to the opening of the heavens; being what was unusual and surprising; and as denoting something to be expressed of great moment and importance. The Jews, in order to render this circumstance less considerable, and to have it believed, that these voices from heaven heard in the time of Jesus, and in relation to him were common things, have invented a great many stories concerning , "the voice", or "the daughter of the voice from heaven"; which they pretend came in the room of prophecy: their (t) words are, "after the death of the latter prophets, Haggai, Zechariah and Malachi, the holy Spirit departed from Israel, and thenceforwards they used "Bath Kol", the "voice". One time they were sitting in the chamber of the house of Guria in Jericho, and there came to them , "the voice from heaven", (saying;) there is one here, who is fit to have the Shekinah (or divine majesty) abide on him, as Moses our master; but because his generation was not worthy, therefore the wise men set their eyes on Hillell, the elder; and when he died, they said concerning him, this was a holy man, a meek man, a disciple of Ezra. Again, another time they were sitting in a chamber in Jabneh, and there came to them "the voice from heaven", (saying;) there is one here, who is fit to have the Shekinah dwell on him; but because his generation was not worthy, therefore the wise men set their eyes on Samuel the little.'' I have cited this passage at large, partly because, according to them, it fixes the date and use of "the voice"; and partly, because it affords instances of it, wherefore more need not be mentioned; for, it would be endless to repeat the several things spoken by it; such as encouraging Herod to rebel, and seize his master's kingdom (u); forbidding Ben Uzziel to go on with his paraphrase on the Hagiographa, or holy books, when he had finished his Targum on the prophets (w); declaring the words of Hillell and Shammai to be the words of the living God (x); signifying the conception, birth, and death of (y) persons, and the like; all which seem to be mere fiction and imagination, diabolical delusions, or satanical imitations of this voice, that was now heard, in order to lessen the credit of it. But, to proceed; this extraordinary voice from heaven, which was formed in articulate sounds for the sake of John; and, according to the other Evangelists, was directed to Christ, Mar 1:11 expressed the following words, "this is my beloved Son". "This" person, who had been baptized in water, on whom the holy Spirit now rested, is no other than the Son of God in human nature; which he assumed, in order to be obedient to this, and the whole of his Father's will: he is his own proper "son", not by creation, as angels, and men; nor by adoption, as saints; nor by office, as magistrates; but in such a way of filiation as no other is: he is the natural, essential, and only begotten Son of God; his beloved Son, whom the Father loved from everlasting, as his own Son; the image of himself, of the same nature with him, and possessed of the same perfections; whom he loved, and continued to love in time, though clothed with human nature, and the infirmities of it; appearing in the likeness of sinful flesh; being in his state of humiliation, he loved him through it, and all sorrows and sufferings that attended it. Christ always was, and ever will be considered, both in his person as the Son of God, and in his office as mediator, the object of his love and delight; wherefore he adds, in whom I am well pleased. Jehovah the Father took infinite delight and pleasure in him as his own Son, who lay in his bosom before all worlds; and was well pleased with him in his office relation, and capacity: he was both well pleased in him as his Son, and delighted in him as his servant, Isa 42:1 he was pleased with his assumption of human nature; with his whole obedience to the law; and with his bearing the penalty and curse of it, in the room and stead of his people: he was well pleased with and for his righteousness, sacrifice and atonement; whereby his law was fulfilled, and his justice satisfied. God is not only well pleased in, and with his Son, but with all his people, as considered in him; in him he loves them, takes delight in them, is pacified towards them, and graciously accepts of them. It would be almost unpardonable, not to take notice of the testimony here given to the doctrine of the Trinity; since a voice was heard from the "father" in heaven, bearing witness to "the Son" in human nature on earth, on whom "the Spirit" had descended and now abode. The ancients looked upon this as so clear and full a proof of this truth, that they were wont to say; Go to Jordan, and there learn the doctrine of the Trinity. Add to all this, that since this declaration was immediately upon the baptism of Christ, it shows that his Father highly approved of, and was well pleased with his submission to that ordinance; and which should be an encouraging motive to all believers to follow him in it. (t) T. Bab. Sanhedrim, fol. 11. 1. Sota, fol. 48. 2. Yoma. fol. 9. 2. (u) T. Bab. Bava Bathra, fol. 3. 2. (w) Megilla, fol. 3. 1. (x) T. Hieros. Beracot, fol. 3. 2. (y) T. Bab. Sanhedrim, fol. 22. 1. T. Hieros. Sabbat. fol. 8. 3. Next: Matthew Chapter 4”
Source
1849
A.D.
1774–1849
“This most solemn testimony of God the Father, relative to his own beloved Son, is repeated below in chap. xvii; and is of such great moment, that the Holy Ghost would have it repeated not only by three evangelists, Matthew, Mark and Luke, but also by St. Peter, as a fourth evangelist, 2nd Peter chap. i. (Tirinus) — In Greek, the emphatic article o uios mou o agapetos , strengthens the proof that Jesus Christ, upon whom the Spirit of God descended in the shape of a dove, was not the adoptive, but natural Son of God, born of Him before all ages, and should silence every blasphemous tongue and pen that can attempt to rob Jesus Christ of his divinity, and poor man of all hopes of salvation, through this God-man, Christ the Lord. But if it here be asked, why Jesus Christ, who was innocence itself, yes, and the very essence of sanctity, condescended so far as to be baptized with sinners, we answer, with the Holy Fathers, that it was, 1. to sanction the baptism and ministry of his precursor; 2. not to lose this opportunity of teaching humility, by placing himself among sinners, as if he had stood in need of the baptism of penance for the remission of sins; and lastly, with St. Ambrose, that it was to sanctify the waters, and to give to them the virtue of cleansing men from their sins by the laver of baptism. (Haydock)”
Source
1863
A.D.
1796–1863
“Thunder is called the voice of God. Articulate sounds were heard on this occasion. '- Luke ix. 35 ; 2 Peter i. 17. Every just man is a child of God ; but Christ is the beloved, the only true son.”
1871
A.D.
1871
“And lo a voice from heaven, saying, This is--Mark and Luke give it in the direct form, "Thou art." (Mar 1:11; Luk 3:22). my beloved Son, in whom I am well pleased--The verb is put in the aorist to express absolute complacency, once and for ever felt towards Him. The English here, at least to modern ears, is scarcely strong enough. "I delight" comes the nearest, perhaps, to that ineffable complacency which is manifestly intended; and this is the rather to be preferred, as it would immediately carry the thoughts back to that august Messianic prophecy to which the voice from heaven plainly alluded (Isa 42:1), "Behold My Servant, whom I uphold; Mine Elect, IN WHOM MY SOUL DELIGHTETH." Nor are the words which follow to be overlooked, "I have put My Spirit upon Him; He shall bring forth judgment to the Gentiles." (The Septuagint perverts this, as it does most of the Messianic predictions, interpolating the word "Jacob," and applying it to the Jews). Was this voice heard by the by-standers? From Matthew's form of it, one might suppose it so designed; but it would appear that it was not, and probably John only heard and saw anything peculiar about that great baptism. Accordingly, the words, "Hear ye Him," are not added, as at the Transfiguration. Next: Matthew Chapter 4”
Source

Undated

date unknown
date
unknown
“(Fulgent. de Fide ad Petrum. c. 9.) Though Father, Son, and Holy Ghost are one nature, yet do thou hold most firmly that They be Three Persons; that it is the Father alone who said, This is my beloved Son; the Son alone over whom that voice of the Father was heard; and the Holy Ghost alone who in the likeness of a dove descended on Christ at His baptism.”
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.