1Then what advantage does the Jew have? Or what is the profit of circumcision? 2Much in every way! Because first of all, they were entrusted with the revelations of God. 3For what if some were without faith? Will their lack of faith nullify the faithfulness of God? 4May it never be! Yes, let God be found true, but every man a liar. As it is written,
“that you might be justified in your words,
and might prevail when you come into judgment.”
5But if our unrighteousness commends the righteousness of God, what will we say? Is God unrighteous who inflicts wrath? I speak like men do. 6May it never be! For then how will God judge the world? 7For if the truth of God through my lie abounded to his glory, why am I also still judged as a sinner? 8Why not (as we are slanderously reported, and as some affirm that we say), “Let’s do evil, that good may come?” Those who say so are justly condemned.
9What then? Are we better than they? No, in no way. For we previously warned both Jews and Greeks that they are all under sin. 10As it is written,
“There is no one righteous;
no, not one.
11There is no one who understands.
There is no one who seeks after God.
12They have all turned away.
They have together become unprofitable.
There is no one who does good,
no, not so much as one.”
13“Their throat is an open tomb.
With their tongues they have used deceit.”
“The poison of vipers is under their lips.”
14“Their mouth is full of cursing and bitterness.”
15“Their feet are swift to shed blood.
16Destruction and misery are in their ways.
17The way of peace, they haven’t known.”
18“There is no fear of God before their eyes.”
19Now we know that whatever things the law says, it speaks to those who are under the law, that every mouth may be closed, and all the world may be brought under the judgment of God. 20Because by the works of the law, no flesh will be justified in his sight; for through the law comes the knowledge of sin.
21But now apart from the law, a righteousness of God has been revealed, being testified by the law and the prophets; 22even the righteousness of God through faith in Jesus Christ to all and on all those who believe. For there is no distinction, 23for all have sinned, and fall short of the glory of God; 24being justified freely by his grace through the redemption that is in Christ Jesus, 25whom God sent to be an atoning sacrifice through faith in his blood, for a demonstration of his righteousness through the passing over of prior sins, in God’s forbearance; 26to demonstrate his righteousness at this present time, that he might himself be just and the justifier of him who has faith in Jesus.
27Where then is the boasting? It is excluded. By what kind of law? Of works? No, but by a law of faith. 28We maintain therefore that a man is justified by faith apart from the works of the law. 29Or is God the God of Jews only? Isn’t he the God of Gentiles also? Yes, of Gentiles also, 30since indeed there is one God who will justify the circumcised by faith and the uncircumcised through faith.
31Do we then nullify the law through faith? May it never be! No, we establish the law.
CHRYSOSTOM. (Hom. xi. [x.] 1) Or thus, After saying that they were born of God, who received Him, he sets forth the cause of this honour, viz. the Word being made flesh, God’s own Son was made the son of man, that he might make the sons of men the sons of God. Now when thou hearest that the Word was made flesh, be not disturbed, for He did not change His substance into flesh, which it were indeed impious to suppose; but remaining what He was, took upon Him the form of a servant. But as there are some who say, that the whole of the incarnation was only in appearance, to refute such a blasphemy, he used the expression, was made, meaning to represent not a conversion of substance, but an assumption of real flesh. But if they say, God is omnipotent; why then could He not be changed into flesh? we reply, that a change from an unchangeable nature is a contradiction.
AUGUSTINE. (con. Serm. Arian. c. 7. [9.]) If men are disturbed however by its being said that the Word was made flesh, without mention of a soul; let them know that the flesh is put for the whole man, the part for the whole, by a figure of speech; as in the Psalms, Unto thee shall all flesh come; (Ps 65:2) and again in Romans, By the deeds of the law there shall no flesh be justified. (Rom 3:20) In the same sense it is said here that the Word was made flesh; meaning that the Word was made man.
This text overthrows Nestorius, who asserted that it was not the very Word, even God, Who the Self-same was made man, being conceived of the sacred blood of the Virgin: but that the Virgin brought forth a man endowed with every kind of virtue, and that the Word of God was united to him: thus making out two sons, one born of the Virgin, i. e. man, the other born of God, that is, the Son of God, united to that man by grace, and relation, and love. In opposition to him the Evangelist declares, that the very Word was made Man, not that the Word fixing upon a righteous man united Himself to him.
Catena Aurea by St. Thomas Aquinas, from https://www.ecatholic2000.com/catena/untitled-89.shtml