The interpretation timeline
Isaiah 49:6 Douay-Rheims

And he said: It is a small thing that thou shouldst be my servant to raise up the tribes of Jacob, and to convert the dregs of Israel. Behold, I have given thee to be the light of the Gentiles, that thou mayst be my salvation even to the farthest part of the earth.

A.D. 389 – 1871 8 witnesses

Patristic

before A.D. 750
389
A.D.
A.D. 329–390
“He is called Servant and serves many well. And his being given the grand title "Child of God" agrees with this. For in truth he was subject as a servant to flesh and to birth and to the conditions of our life with a view toward our liberation. He was subject to all that he saved, held captive as we were in sin.”
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“It is one thing to be named Son according to the divine substance; it is another thing to be so called according to the adoption of human flesh. For, according to the divine generation, the Son is equal to God and Father, and, according to the adoption of a body, he is a servant to God the Father. "For," it says, "he took upon him the form of a servant." The Son is, however, one and the same.… According to his glory, he is Lord to the holy patriarch David but David's son in the line of actual descent, abandoning nothing of his own but acquiring for himself the rights that go with the adoption into our race. Not only does he undergo service in the character of man by reason of his descent from David, but also by reason of his name, as it is written: "I have found David my servant";4 and elsewhere: "Behold, I will send to you my Servant, the Orient is his name." And the Son himself says, "Thus says the Lord, that formed me from the womb to be his servant and said to me: It is a great thing for you to be called my servant. Behold, I have set you up for a witness to my people and a light to the Gentiles, that you may be for salvation to the ends of the earth." To whom is this said, if not to Christ? Who, being in the form of God, emptied himself and took on him the form of a servant. But what can be in the form of God, except that which exists in the fullness of the godhead?”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“And He said, “It is too light for you to be, etc.” In My eyes, it is too small a gift that you should have this alone, that you be My servant to establish Jacob and to bring back to Me the besieged of Israel, and behold I add more to you, “And I will make you a light for the nations,” to prophesy concerning the downfall of Babylon, which will be a joy for the whole world. and the besieged of Israel Heb. וּנְצוּרֵי. Comp. (Prov. 7:10) “With a heart surrounded by evil thoughts (וּנְצֻרַת),” that their heart is surrounded by the inclination of sinful thoughts, like a city besieged by a bulwark of those who besiege it.”
Source
1167
A.D.
Ibn Ezra Jewish
1089–1167
“It is a slight thing, in mine eyes, that thou shouldst be a servant to bring Israel back to their land by thy word. ונצורי And the ruins of. Comp. נצורה desolate (1:8).— Not alone wilt thou bring Israel back, but I will give thee for a light of nations. להיות ישועתי. That my salvation may be, that is, that my salvation maybe published before it comes, unto the end of the earth”
Source
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“Hear, O islands, etc. In this part he pursues the order of the liberation more specifically; and concerning this he does two things. First the people confesses the benefits received; second it receives the promise of things to come, there, I said: in vain, etc. Concerning the first, four benefits are confessed. First, the privilege of the divine election; and it continues why the prophet had above enjoined the people, that they should announce it. Whence immediately is subjoined the voice of the people announcing, and saying, Hear. From the womb, choosing me in the fathers themselves. Ps. 21: From the womb of my mother, God, etc. Second, the efficacy of prayer: and he set the mouth, prayer, as a sword, penetrating even to the ears of God and the depths of his mercy, Eph. ult.: the sword of the spirit, etc. Third, the help of divine protection: in the shadow, that is, under the protection of his power, as an archer hides a chosen arrow, to preserve it. Ps. 16: under the shadow of thy wings, etc.; Ps. 26: he hath hidden me in his tabernacle, etc. Fourth, the glory of the divine power: and he said to me: in thee will I glory; through the great things shown in thee I will appear glorious. Above, 43: every one that calleth upon my name, etc. According to others, this is the voice of Cyrus, whose name was foretold by Isaiah above, 45, before he was born; whose threatening words were as a sword, and he was protected lest his grandfather should kill him, and was kept as a chosen arrow for the appointed time; to whom it was announced that the people of Israel was the servant of God. Otherwise it is expounded of Christ; whose name was foretold by the Angel; the word of preaching, a sword piercing hearts; protected, on account of the weakness of the flesh, by the power of the divinity, and chosen among all for the fulfilling of the salvation of the human race. And he is called Israel, because he was born of the people of Israel according to the flesh. I said: here the Lord promises future benefits: and first he promises the prophet Isaiah exaltation; second, to the people liberation, there, thus saith the Lord the redeemer, etc. Concerning the first, two things. First is set down the allegation of the prophet, setting forth his labor in preaching, although through the fault of the hearers no fruit followed: and he concludes: therefore my judgment, on my behalf, is with the Lord, before him, and my work, as pleasing to him. Jer. 6: the founder hath melted in vain, etc. Second, he sets down God's response: and now thus saith the Lord: and first is signified the acceptance of the allegation, that I may bring back, as if to say: choosing me from the womb of my mother for this, that I might recall his people to him. And yet Israel shall not altogether be gathered, to him through my preaching. And yet I am glorified, etc.; Habac. 3: God, the Lord, is my strength, etc. Second, the response itself is set down, and he said: it is a small thing, as if to say: so greatly will I honor thy ministry that not only among the Jews, but among all the nations, my salvation shall be announced through thee. Rom. 3: is he the God of the Jews only? etc. This too is plainly expounded of Christ, who by his preaching and the consummation of his death made little fruit among the Jews, but enlightened and saved the nations. Likewise also of Cyrus, though more forcedly, who through his kindnesses, according to the Lord's intention, recalled the people to the worship of God, and yet did not succeed, to whom dominion over many nations was given by God. Thus saith the Lord the redeemer, etc. Here he promises liberation: and concerning this he does two things. First he promises liberation; second he excludes their doubt, there, and Sion said, etc. Concerning the first, three things. First, the things preceding liberation, namely the veneration of the Jews, which was the cause of the liberation; recalling their former contempt: contemptible, on account of the people's weakness; abominable, on account of the singularity of their worship; a servant, on account of subjection to diverse nations, above, 18: to a nation rent asunder, etc.; and he sets down the veneration itself: kings shall see the great things I will show for thee, and shall adore, as, according to the letter, Nabuchodonosor, Dan. 2, and Cyrus, and his other princes honored Esdras. Another preamble is the exaltation of the liberating king, namely Cyrus: in an acceptable time, and he does not determine the time of the exaltation: acceptable, when it shall please me to save my people, I have heard, exalting thee into a kingdom, according to thy desire, and the fruit of the exaltation: and I have preserved, etc., for the fulfilling of the covenant of my people. Be revealed, that is, be enlightened. Or of Christ, who in his passion was despised, and judged as it were a servant. Below, 53: we saw him despised, etc., but afterward, according to the letter, adored by kings. Ps. 71: all kings shall adore him, etc.; in an acceptable time, namely the time of grace. 2 Cor. 6: behold, now is the time, etc. Second, he sets down the things consequent upon the liberation, promising to the liberated an abundance of good things: they shall feed in the ways; that is, they shall enjoy consolations as abundantly as sheep enjoy pastures, when they are found even in the way, beyond the usual. Ezech. 34: they shall rest in the grass, etc.; as to the absence of evils, both of want, he shall not hunger, etc., and of harm inflicted, the heat, of tribulation; and the sun, the tyrant causing it. Ps. 120: the sun shall not burn by day, etc.; and he assigns the cause of both. Because he that is merciful, etc.; of waters, of consolations. Ps. 22: the Lord ruleth me. Third, he promises the liberation itself, setting down the preparation of the ways: and I will make all the mountains; that is, the princes will help you to return. Above, 40: every valley shall be filled, etc.; setting down also the return of the captives: behold these from afar, from the east, the sea, the west. Jer. 31: I will bring them from the north, etc.; he sets down also the giving of thanks: praise, ye heavens, etc.; Ps. 68: let the heavens praise him, etc. And Sion said, etc. Here he excludes their doubt: and first that which arose from the divine indignation; second that which arose from their dejection, there, and thou shalt say in the heart, etc.; third that which arose from the power of the enemies, there, shall it be taken away, etc. Concerning the first, two things. First he sets down the doubt: hath forsaken, without help; and therefore I cannot hope for liberation. Baruch 4: I am forsaken, etc.; second he excludes it by the likeness of a mother: is it possible, etc.; Jer. 31: if a son honorable, etc.; third he applies the promise concerning the restoration of the city: and first as to the rebuilding of the walls, setting down the divine purpose: behold, in my hands; as if to say: thus I hold thee in memory, as one who writes, or makes some sign on his hand, that he may be mindful of some thing. Thy walls; as if to say, now I see the rebuilding of thy walls. Job 37: he hideth in the hands, etc.; Ps. 89: a thousand years before the eyes, etc.; and the manner of the fulfillment: builders have come, that is, rebuilders, namely Zorobabel, and Jesus, and others, already in my eyes; the scatterers, the Chaldeans. Zach. 4: the hands of Zorobabel, etc. Second, as to the habitation of men: and concerning this he does three things. First, the gathering together of the citizens: lift up round about, etc.; Baruch 4: look about, Jerusalem, etc. Second, the re-inhabiting of the city, showing that it shall be inhabited. As I live, the manner of an oath; as with an ornament — as a bride with garments, so the city is adorned with citizens. Below, 61: he hath clothed me with the garment of salvation, etc.; showing that it shall be filled with inhabitants: for the desert places, as to inhabitants, the solitudes, as to the tillers, the ruins, as to the destroyed walls. Zach. 2: it shall be inhabited without a wall, etc.; he shows also that it shall be emptied of enemies: and far, etc. Third, he foretells the multitude of the inhabitants: still shall the children of sterility say, that is, those who were born when thou didst believe thyself barren, emptied of inhabitants. Below, 54: enlarge the place of the tent, etc. And thou shalt say in the heart, etc. Here he excludes the second doubt: and first he sets down the wonder, and thou shalt say, out of wonder: barren, because there were not in me men who could beget children; destitute, of divine help. Below, 66: who hath ever heard such, etc. Second he excludes the doubt, setting down the manner of the multitude of the inhabitants: thus saith the Lord: as to four things. First, as to the divine inspiration: behold I will lift up the hand, as it were making a sign; above, 11: he shall lift up a sign among the nations, etc. Second, as to the honorable bringing back: and they shall bring in the arms, in which is signified the help which they had from the nations. Kings, foster-fathers, providing for thee in necessities. Baruch 5: the Lord will bring them to thee, etc. Third, as to the exaltation of the liberated: with the face to the earth, this especially at the time of the Machabees; below, 40: they shall come to thee bowed down, etc. Fourth, he assigns the reason for this: and thou shalt know that I, etc.; Ps. 70: in thee, O Lord, have I hoped, let me not be confounded, etc. Shall it be taken away. Here he excludes the third doubt: and first he sets it down, from the strong, Nabuchodonosor; Matth. 12: or how can one enter, etc. Second he excludes it: for thus he saith, first setting down the benefit of the liberation: the captivity, namely of the Jews. Job 29: I broke the jaws of the wicked one, etc.; second, the manner of the liberation, setting down the destruction of the enemies. But them, namely the Chaldeans, they judged, unjustly. Soph. 3: I will kill, etc.; and he sets down the determination of the punishment: and I will feed: either on account of dissension, as above, 9: every man the flesh of the arm, etc., or on account of the multitude of the dead, while the mouth of one fell upon the blood of another, as if he would drink: or on account of famine. Third, he sets down the fruit of the liberation: and all flesh shall know, etc.; above, 40: all flesh shall see, etc.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And he said,.... Or "even he said"; namely, the Lord his God, that called, appointed, and strengthened him for his service: it is a light thing that thou shouldest be my servant to raise up the tribes of Jacob, and to restore the preserved of Israel; the tribes of Jacob and the preserved of Israel are the elect of God among the Jews; though the characters agree with all the chosen of God of other nations, who, are distinguished from the rest of the world, and are "preserved in Christ", Jde 1:1, where they are preserved before they are redeemed and called; not from falling in Adam with the rest of mankind, nor from the general corruption of nature, nor from actual sins and transgressions; yet from the condemnation of the law, the damning power of sin, and the second death; the ground of which is, their being in the love of God, in the covenant of grace, and in the hands of Christ: and yet, notwithstanding this, they are in a most miserable condition as the descendants of Adam, and, in a state of nature; they are "fallen" creatures, which is supposed by the "raising them up" by Christ, whose work it is; they fell in Adam, and are fallen from a state of honour, friendship, and communion with God; from the glorious image stamped on man in his creation; from righteousness and holiness into sin and misery, poverty and beggary; into a very low estate indeed, and are not able to raise up themselves, being feeble and without strength, yea, dead in trespasses and sins; they are gone back from God, and out of the good way, and are gone astray like lost sheep, which is supposed by the "restoring" of them: now it is Christ's work to "raise up", "restore", or "return" these; he raises them to a state of justification and acceptance with God, to a better righteousness than they fell from, and to greater riches, honour, and glory; in consequence of redemption by Christ they are raised to a state of grace here, and to glory hereafter; they are brought nigh to God, from whom they were departed, sons to have access unto him and fellowship with him now, and to be with him for evermore. Now to do all this is said to be a "light thing"; it was not so in itself, it was a "great thing", famous and excellent, to be a servant of the Lord, and to be employed in such work as this; and so the Septuagint and Arabic versions render it; but this is to be understood either by way of interrogation, as by the Targum, Kimchi, Ben Melech, and so the Syriac version, "is it a matter of small moment that thou shouldest be my servant?" &c.; surely it is not; or, if it is, I will find thee other work to do: or else it is to be understood comparatively, the elect of God among the Jews being few, in comparison of those among the Gentiles; wherefore it was not work enough, nor honour enough, only to be employed in the redemption of them: and therefore it follows, I will also give thee for a light to the Gentiles; which supposes the Gentiles to be in a state of darkness, as they were before the coming of Christ, and the ministration of the Gospel to them; they were in the dark about the divine Being, the unity of God, and the persons in the Godhead; about the worship of God; about a future state, and about their own state and condition; and about revelation, the truths, doctrines, and ordinances of it: and this expresses, that Christ should be a "light" to them, as he has been, not only in a way of nature, as he is to every man, but in a way of special grace through the ministry of the word; not in his own person, for he only preached in Judea, but by his apostles, by whom he went and preached peace to them afar off; and particularly he was so to them by his Spirit, as a spirit of illumination; and so they came to have light in divine things, and which is a "gift" of the free grace of God. Simeon has respect to this passage, Luk 2:32 and the Apostle Paul cites it, and applies it to Gospel times, Act 13:47, it follows, that thou mayest be my salvation unto the end of the earth; Christ was given, that he might be the author of that salvation, which God had chosen and appointed his people to, and provided for them in covenant; and that being the salvation of his own people, he calls it his own salvation; and which should reach to them all everywhere, in the several parts of the world, and the corners and ends of it, east, west, north, and south, wherever they were. Kimchi refers this to the saving of the Gentiles, after the war of Gog and Magog, yet to come; and with it compares Isa 60:3.”
Source
1849
A.D.
1774–1849
“Earth. St. Paul, explains this of Christ, (Acts xiii.) who said, Go teach all nations, Matthew xxviii. Isaias was one of his first preachers.”
1871
A.D.
1871
“It is a light thing--"It is too little that Thou shouldest," [HENGSTENBERG], that is, It is not enough honor to Thee to raise up Jacob and Israel, but I design for Thee more, namely, that Thou shouldest be the means of enlightening the Gentiles (Isa 42:6-7; Isa 60:3). the preserved--namely, those remaining after the judgments of God on the nation--the elect remnant of Israel reserved for mercy. LOWTH, with a slight but needless change of the Hebrew, translates for "tribes" and "preserved," the "scions"--the "branches."”
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.