What he means is somewhat as follows. Pharaoh was a vessel of wrath, that is, a man who by his own hard-heartedness had kindled the wrath of God. For after enjoying much long-suffering, he became no better, but remained unimproved. Wherefore he calls him not only "a vessel of wrath," but also one "fitted for destruction." That is, fully fitted indeed, but by his own proper self. For neither had God left out anything of the things likely to recover him, nor did he leave out anything of those that would ruin him, and put him beyond any forgiveness. Yet still, though God knew this, "He endured him with much long-suffering," being willing to bring him to repentance. For had He not willed this, then He would not have been thus long-suffering. But as he would not use the long-suffering in order to repentance, but fully fitted himself for wrath, He used him for the correction of others, through the punishment inflicted upon him making them better, and in this way setting forth His power. For that it is not God's wish that His power be so made known, but in another way, by His benefits, namely, and kindnesses, he had shown above in all possible ways. For if Paul does not wish to appear powerful in this way ("not that we should appear approved," he says, "but that you should do that which is honest,") [2 Corinthians 13:7], much less does God. But after that he had shown long-suffering, that He might lead to repentance, but he did not repent, He suffered him a long time, that He might display at once His goodness and His power, even if that man were not minded to gain anything from this great long-suffering. As then by punishing this man, who continued incorrigible, He showed His power, so by having pitied those who had done many sins but repented, He manifested His love toward man. But it does not say, love towards man, but glory, to show that this is especially God's glory, and for this He was above all things earnest. But in saying, "which He had afore prepared unto glory," he does not mean that all is God's doing. Since if this were so, there were nothing to hinder all men from being saved. But he is setting forth again His foreknowledge, and doing away with the difference between the Jews and the Gentiles. And on this topic again he grounds a defense of his statement, which is no small one. For it was not in the case of the Jews only that some men perished, and some were saved, but with the Gentiles also this was the case. Wherefore he does not say, all the Gentiles, but, "of the Gentiles," nor, all the Jews, but, "of the Jews." As then Pharaoh became a vessel of wrath by his own lawlessness, so did these become vessels of mercy by their own readiness to obey. For though the more part is of God, still they also have contributed themselves some little. Whence he does not say either, vessels of well-doing, or vessels of boldness (παρρησίας), but "vessels of mercy," to show that the whole is of God. For the phrase, "it is not of him that wills, nor of him that runs," even if it comes in the course of the objection, still, were it said by Paul, would create no difficulty. Because when he says, "it is not of him that wills, nor of him that runs," he does not deprive us of free-will, but shows that all is not one's own, for that it requires grace from above. For it is binding on us to will, and also to run: but to confide not in our own labors, but in the love of God toward man. And this he has expressed elsewhere. "Yet not I, but the grace which was with me." [1 Corinthians 15:10] And he well says, "Which He had afore prepared unto glory." For since they reproached them with this, that they were saved by grace, and thought to make them ashamed, he far more than sets aside this insinuation. For if the thing brought glory even to God, much more to them through whom God was glorified. But observe his forbearance, and unspeakable wisdom. For when he had it in his power to adduce, as an instance of those punished, not Pharaoh, but such of the Jews as had sinned, and so make his discourse much clearer, and show that where there were the same fathers, and the same sins, some perished, and some had mercy shown them, and persuade them not to be doubtful-minded, even if some of the Gentiles were saved, while the Jews were perishing; that he might not make his discourse irksome, the showing forth of the punishment he draws from the foreigner, so that he may not be forced to call them "vessels of wrath." But those that obtained mercy he draws from the people of the Jews. And besides, he also has spoken in a sufficient way in God's behalf, because though He knew very well that the nation was fitting itself as a vessel of destruction, still He contributed all on His part, His patience, His long-suffering, and that not merely long-suffering, but "much long-suffering;" yet still he was not minded to state it barely against the Jews. Whence then are some vessels of wrath, and some of mercy? Of their own free choice. God, however, being very good, shows the same kindness to both. For it was not those in a state of salvation only to whom He showed mercy, but also Pharaoh, as far as His part went. For of the same long-suffering, both they and he had the advantage. And if he was not saved, it was quite owing to his own will: since, as for what concerns God, he had as much done for him as they who were saved. Having then given to the question that answer which was furnished by facts, in order to give his discourse the advantage of other testimony in its favor, he introduces the prophets also making the same declarations aforetime. For Hosea, he says, of old put this in writing, as follows:
I think there are many, even some apparently good commentators, who hurry over this part of the epistle because they think it is superfluous and of little importance. They probably think much the same about the genealogies in the Gospels. Because it is a catalog of names, they think they can get nothing good out of it. People who mine gold are careful even about the smallest fragments, but these commentators ignore even huge bars of gold!
It may be that these were Paul’s kinsmen according to the flesh, but the expression “my fellow prisoners” is what fascinates me. When was Paul in captivity? It seems that this was the captivity of sin and that they were together with him in the blindness of unbelief. When Christ came they were set free, as was Paul.
This also looks like an encomium. And what follows is much more so. And what sort is this of? "And my fellow-prisoners." For this is the greatest honor, the noble proclamation. And where was Paul a prisoner, that he should call them "my fellow-prisoners?" A prisoner indeed he had not been, but he had suffered things worse than prisoners, in being not an alien only to his country and his family, but in wrestling with famine and continual death, and thousands of other things. For of a prisoner the only misfortune is this, that he is separated from his relations, and often has to be a slave instead of being free. But in this case one may mention temptations thick as snow-flakes, which this blessed person underwent by being carried and taken about, scourged, fettered, stoned, shipwrecked, with countless people plotting against him. And captives indeed have no further foe after they are led away, but they even experience great care from those who have taken them. But this man was continually in the midst of enemies, and saw spears on every side, and sharpened swords, and arrays, and battles. Since then it was likely that these shared many dangers with him, he calls them fellow-captives. As in another passage also, "Aristarchus my fellow-prisoner." [Colossians 4:10] Then another praise besides. "Who are of note among the Apostles." And indeed to be apostles at all is a great thing. But to be even among these of note, just consider what a great encomium this is! But they were of note owing to their works, to their achievements. Oh! How great is the devotion (φιλοσοφία) of this woman, that she should be even counted worthy of the appellation of apostle! But even here he does not stop, but adds another encomium besides, and says, "Who were also in Christ before me."
For this too is a very great praise, that they sprang forth and came before others. But let me draw your attention to the holy soul, how untainted it is by vanity. For after glory such as his in kind and degree, he sets others before himself, and does not hide from us the fact of his having come after them, nor is ashamed of confessing this. And why are you surprised at his not being ashamed of this, when he shuns not even to parade before men his former life, calling himself "a blasphemer, and a persecutor?" [1 Timothy 1:13] Since then he was not able to set them before others on this score, he looked out himself, who had come in after others, and from this he did find means of bestowing a praise upon them by saying, "Who were in Christ before me."
It was the greatest of honors to be counted a fellow prisoner of Paul’s.… Think what great praise it was to be considered of note among the apostles. These two were of note because of their works and achievements. Think how great the devotion of this woman Junia must have been, that she should be worthy to be called an apostle! But even here Paul does not stop his praise, for they were Christians before he was.
Yet more praises. These people were companions of Paul in his sufferings and even shared imprisonment with him. Hence he says that they are men and women of note, not among the pupils but among the teachers, and not among the ordinary teachers but among the apostles. He even praises them for having been Christians before him.
[AD 407] John Chrysostom on Romans 9:22-23:24