As he hath commanded. The place is taken out of Isaiah, where, notwithstanding, God doth rather speak unto his Son than unto the apostles. But we must note, that many things which the Scripture attributeth to Christ do appertain unto his ministers. I say many things; not all things: for there be certain titles proper to the person of Christ, wherewith to adorn the ministers were wicked sacrilege. Christ is called our Righteousness, because he was the only purging sacrifice, [1] and hath reconciled the Father to us by his death, and did rise again afterward, that, having overcome death, he might purchase for us eternal life. Therefore the whole substance of our salvation is in Christ's person; but inasmuch as he worketh by his ministers, by resigning to them his office, he doth also impart with [to] them his titles. Of this sort is the preaching of the gospel. He alone was appointed by the Father to be our teacher; but he hath put in his place pastors and doctors, who speak, as it were, out of his mouth. So that the authority remaineth wholly to him, and he is nevertheless heard in his ministers. Therefore Paul doth fitly apply unto himself the testimony of Isaiah, where he intreateth of the preaching of the gospel. I have made thee a light. It should seem that he speaketh in that place of such a calling of the Gentiles as doth not carry with it the casting off of the old people. For God doth rather associate strangers unto the Jews, who were before of the household. It is but a small matter, saith he, that thou be my minister in teaching Israel, because I have made thee a light to the Gentiles. God doth seem to begin his Church among the children of Abraham, and, that done, to reach out his hand to the Gentiles, that they may both make one Church by one consent of faith. But Paul doth in such sort cite the prophecy, as if it could not be fulfilled unless the Jews had been cast off. For he signifieth that the light of Christ was lighted to the Gentiles, after that they were cast into the darkness of death. I answer, that this cannot be necessarily proved out of the text, that Paul doth affirm that the Gentiles could not have been illuminated before the light of the Jews had been put out. For this may be the sense, Forasmuch as you have deprived yourselves of eternal life, there is no cause why ye should think that the grace of God is profaned, if, leaving you, we take care and charge of the Gentiles; for the Messiah is not given to you alone, but he is appointed to be the Savior of the whole world; as it is written, "I have made thee," etc.; although, if you weigh the place of the prophet more thoroughly, you shall find the casting off of the old people included therein. For God pronounceth that he will be glorious and renowned in the ministry of Christ, though Israel be not gathered together. He addeth afterward, by way of exposition, that the power of Christ shall not be restrained unto one people only, because his light shall shed abroad his beams unto the farthest parts of the world unto salvation. It seemeth that Paul noteth this occasion of calling the Gentiles, namely, because, seeing he found no matter to exercise himself in among the Jews, he gave himself wholly to the Gentiles. We must note this by the way, in the words of the prophet, that salvation is put after light, according to that saying of Christ, "This is eternal life, to know thee, the true God," etc. (John 17:3.) For if the knowledge of God alone bring to us salvation, it is likewise the only resurrection from destruction of eternal death, for us to be illuminated into the faith of Christ, after that we be delivered from the darkness of ignorance.

Footnotes

1 - "Victima expiatrix," expiatory victim

For so - Paul, as usual, appeals to the Scriptures to justify his course. Here he appeals to the Old Testament rather than to the command of the Saviour, because the Jews recognized the authority of their own Scriptures, while they would have turned in scorn from the command of Jesus of Nazareth.
I have set thee - I have constituted or appointed thee. This passage is found in Isaiah 49:6. See the notes on Isaiah 49:1-6.
To be a light - See the notes on John 1:4.
Of the Gentiles - This was in accordance with the uniform doctrines of Isaiah, Isaiah 42:1; Isaiah 54:3; Isaiah 60:3, Isaiah 60:5,Isaiah 60:16; Isaiah 61:6, Isaiah 61:9; Isaiah 62:2; Isaiah 66:12; compare Romans 15:9-12.
For salvation - To save sinners.
Unto the ends of the earth - To all lands; in all nations. See the notes on Acts 1:8.

For so the Lord commanded us - The apostles could quote a pertinent scripture for every thing they did; because the outlines of the whole Gospel dispensation are founded in the law and the prophets; and they were now building the Church of God according to the pattern shown them in the Mount. In the things of God, no man nor minister should go farther than he can say, Thus it is written, and thus it behoves me to do; and let him see that his quotations are fairly made, and not a detached passage or member of a sentence produced, because it seems to look like the system he wishes to establish.
I have set thee to be a light of the Gentiles - This quotation is from Isaiah 49:6, and was most fully in point. The Jews could not resist the testimony of their own prophet; and the Gentiles rejoiced to find that the offers of salvation were to be made so specifically to them.
For salvation unto the ends of the earth - The very name of the Messiah, viz Jesus, announced the design and end of his mission. He is the Savior, and is to be proclaimed as such to the ends of the earth; to all mankind; to every nation, and people, and tongue; and, wherever the Gospel is preached, there is a free, full, and sincere offer of salvation to every soul that hears it. And the offer is proof sufficient, in itself, that there is a power to receive its blessings given to those to whom the offer is made; as it would be of no use to offer them a salvation which it was designed they either should not or could not receive. A son of Satan might be capable of such dissimulation and bad faith; but the holy God cannot.

For so hath the Lord commanded us,.... For though Christ in his first commission restrained his disciples from going into the Gentiles, and preaching to them, yet when he enlarged their commission after his resurrection, he bid them go into all nations, and preach the Gospel to every creature; and told them, that they should be his witnesses to the uttermost part of the earth; see Matthew 28:19 unless this should rather be thought to refer to what follows:
saying; or "as it is written", as the Syriac version supplies; or "because so saith the Scripture", as the Ethiopic version, namely in Isaiah 49:6.
I have set thee to be a light of the Gentiles; to enlighten the Gentiles that sit in darkness, by the preaching of the Gospel to them, and the Spirit of God attending it: this supposes the Gentiles to have been in darkness; as they were about divine things, before the times of the Gospel: they had no true knowledge of God himself; for though they knew there was a God, they did not know, at least but few of them, that there was but one God; and none of them knew anything of him as in Christ; they had not a revelation of his will, they were without the written law, and were strangers to the true manner of worshipping the divine Being; they knew nothing at all of the Messiah, and of his righteousness and salvation by him; nor of the Spirit of God, and the operations of his grace, nor of the resurrection of the dead, and were very ignorant of a future state: it was therefore an unspeakable mercy to them, that Christ was appointed to be a light to them; not in a way of nature, as he is that light which lightens every man that comes into the world; but in a way of grace, through the ministration of the Gospel, and by the special illuminations of the divine Spirit; whereby they see there is a righteous judge, and that there will be a righteous judgment; and that sin is exceeding sinful, and cannot be atoned for by them, and therefore they are in themselves miserable and undone; and they further see, that pardon and righteousness are only by Christ, and that salvation is alone in him. The words are spoken by God the Father to his Son, and express the eternal decree of God, and the designation of Christ to be the light of his people; the mission of him in time as the light of the world, and the exhibition of him in the Gospel, for the illumination of men by his Spirit and grace. In the Hebrew text it is, "I will give thee", &c. for all this springs from the free grace of God; Christ in all respects is the gift of God, as he is the head of the church, and the Saviour of the body, so as he is the light of men; and it is necessary that he should be light, in order to be salvation, as follows; for though men may go to hell in the dark, yet not to heaven; the way of the wicked is darkness, but the path of just is shining light: those whom God rives, he enlightens with the light of life:
that thou shouldest be for salvation to the ends of the earth; impetratively as the author of it, and applicatively by means of the Gospel, which publishes salvation by Christ; and is the power of God unto salvation, to Gentiles as well as Jews, even to all that believe, in what part of the world soever they live: thus what was decreed and resolved on by God the Father, and was declared by him to his Son, is applied to his ministers and ambassadors, who represented him; so that what they did, he may be said to do; and who by them was to go, and did go to the Gentiles, and enlighten them with the light of the Gospel, and became salvation to them; so that this prophecy is produced by the apostles, to vindicate their conduct, as well as to show the agreement between the command of Jesus Christ to his disciples, and the decree of God the Father; as also to illustrate and confirm the particular order, which the Apostle Paul had, to go to the Gentiles, and to which he may have a regard here; see Acts 26:17. In the Hebrew text it is, "my salvation": provided, promised, and sent by God, the Saviour of his people.

For so hath the Lord commanded us, saying, &c.--These and other predictions must have been long before this brought vividly home to Paul's mind in connection with his special vocation to the Gentiles.
I have set thee--that is, Messiah; from which Paul inferred that he was but following out this destination of his Lord, in transferring to the Gentiles those "unsearchable riches" which were now by the Jews rejected and despised.

For so hath the Lord commanded. It was not only the Lord's will that they should preach first to the Jews, but that they should then turn to the Gentiles. So the Lord had shown in their own prophets. Isaiah 49:6 is quoted, where Christ is declared to be "a light of the Gentiles," and appointed "for salvation to the ends of the earth;" a world Savior.

For so hath the Lord commanded us - By sending us forth, and giving us an opportunity of fulfilling what he had foretold. I have set thee - The Father speaks to Christ. Isaiah 49:6.