Behold my servant, whom I uphold;
mine elect, in whom my soul delighteth;
I have put my spirit upon him:
he shall bring forth judgment to the Gentiles.

He shall not fail nor be discouraged,
till he have set judgment in the earth:
and the isles shall wait for his law.

I, the LORD have called thee in righteousness,
and will hold thine hand, and will keep thee,
and give thee for a covenant of the people,
for a light of the Gentiles;

To open the blind eyes,
to bring out the prisoners from the prison,
and them that sit in darkness
out of the prison house.

Isaiah 42:1,4,6,7 KJV

Isa 42:1 Behold - The prophet having given one eminent instance of God's certain fore - knowledge, in the deliverance of the Jews by Cyrus, now adds another more eminent example of it, by foretelling the coming of the Messiah. This place therefore is expressly interpreted of Christ, Mat_12:18, &c. And to him, and to him only, all the particulars following, truly and evidently belong. Whom - Whom I will enable to do and suffer all those things which belong to his office. Elect - Chosen by me to this great work. Delighteth - Both for himself and for all his people, being fully satisfied with that sacrifice, which he shall offer up to me. Bring forth - Shall publish or shew, as this word is translated, Mat_12:18. Judgment - The law, and will, and counsel of God, concerning man's salvation. Gentiles - Not only to the Jews, but to the Heathen nations.

Isa 42:4 'Till - 'Till he has established his law or doctrine, among the nations of the earth. Isles - The countries remote from Judea, shall gladly receive his doctrine.

Isa 42:6 Called thee - To declare my righteousness, or faithfulness. With - hold - Will give thee counsel and strength for the work. Give thee - To be the mediator in whom my covenant of grace is confirmed with mankind. The people - Of all people, not only of Jews but Gentiles. A light - To enlighten them with true and saving knowledge.

John Wesley's Explanatory Notes

Isa 42:7 To open the blind eyes,.... Of the idolatrous Gentiles, who were spiritually blind, and knew not the wretchedness of their case; the exceeding sinfulness of sin; their need of a Saviour, and who he was; as they did, when their eyes were opened by means of the Gospel sent among them, through the energy of the divine Spirit; for this is a work of almighty power and efficacious grace:

to bring out the prisoners from the prison; who were concluded in sin, shut up in unbelief, and under the law, the captives of Satan, and held fast prisoners by him and their own lusts, under the dominion of which they were:

and them that sit in darkness out of the prison house: of sin, Satan, and the law; being under which, they were in a state of darkness and ignorance as to things divine and spiritual. The allusion is to prisons, which are commonly dark places. Vitringa, by the "prisoners", understands the Jews shut up under the law; and by those in "darkness" the Gentiles, destitute of all divine knowledge.

John Gill's Exposition of the Entire Bible