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:
Although Paul establishes the principle that nothing is unclean in itself, and he gives complete freedom to believers to eat whatever they like, nevertheless he proceeds to restrict that freedom for the sake of building up the freedom of brotherly love.
In another epistle Paul says: Food is meant for the stomach and the stomach for food, and God will destroy both one and the other. Since God does not care one way or the other about food, Paul tells us to maintain a spirit of charity, by which God has seen fit to deliver us from sin.
For "if for the sake of meat our brother be made sad, or shocked, or made weak, or caused to stumble, we are not walking in the love of God. For the sake of meat you cause him to perish for whose sake Christ died." For, in "thus sinning against your brethren and wounding their sickly consciences, you sin against Christ Himself. For, if for the sake of meat my brother is made to stumble," let us who are believers say, "Never will we eat flesh, that we may not make our brother to stumble." [1 Corinthians 8:12-13] These things, moreover, does ever one who truly loves God, who truly takes up his cross, and puts on Christ, and loves his neighbour; the man who watches over himself that he be not a stumbling-block to any one, that no one be caused to stumble because of him and die because he is constantly with maidens and lives in the same house with them — a thing which is not right — to the overthrow of those who see and hear. Evil conduct like this is fraught with stumbling and peril, and is akin to death. But blessed is that man who is circumspect and fearful in everything for the sake of purity!
You see how far, for the present, he goes in affection for him, showing that he makes so great account of him, that with a view not to grieve him he does not venture even to enjoin things of great urgency, but by yieldingness would rather draw him to himself, and by charity. For even when he has freed him of his fears, he does not drag him and force him, but leaves him his own master. For keeping a person from meats is no such matter as overwhelming with grief. You see how much he insists upon charity. And this is because he is aware that it can do everything. And on this ground he makes somewhat larger demand upon them. For so far he says from its being proper for them to distress you at all, they ought even, if need be, not to hesitate at condescending to you. Whence he proceeds to say, "Destroy not him with your meat, for whom Christ died." Or do you not value your brother enough even to purchase his salvation at the price of abstinence from meats? And yet Christ refused not to become a slave, nor yet to die for him; but thou dost not despise even food, that you may save him. And yet with it all Christ was not to gain all, yet still He died for all; so fulfilling His own part. But are you aware that by meat you are overthrowing him in the more important matters, and yet makest a disputing? And him who is the object of such care unto Christ, do you consider so contemptible, and dishonor one whom He loves? Yet He died not for the weak only, but even for an enemy. And will you not refrain from meats even, for him that is weak? Yet Christ did what was greatest even, but thou not even the less. And He was Master, thou a brother. These words then were enough to tongue-tie him. For they show him to be of a little spirit, and after having the benefit of great things from God, not to give in return even little ones.
You see how far Paul bends in the name of charity, endeavoring to draw the erring brother by yielding to him so as not to hurt him. For even when he has freed him from his fears, he does not drag or force him but leaves him to his own decision. Abstaining from food is not in the same category as seriously injuring somebody by what you eat.Do you not value your brother enough even to purchase his salvation at the price of abstaining from certain types of food? Christ did not refuse to become a servant and even to die for him, but you will not even give up your food in order to save him!
One who ruins his brother has subverted peace and harmed joy in a way which is more serious even than stealing money. What is worse is that although another has saved him, you have wronged him and ruined him.
Paul did not say that a brother is distressed because of fasting but because of food; therefore you should not incite or constrain anyone by the example of what you eat. If your neighbor eats something which is not good for him against his will, you are no longer loving him as yourself if you are not thinking of his good as much as of your own.
Look at how wonderfully Paul develops his argument. He starts off at the bottom, by referring to food. Then he goes on to call the person who is sinned against a “brother.” Then he calls what has been done to him “destruction.” Fourth, he says that this outrage has been committed against someone “for whom Christ died.” Fifth, he says that someone who does this causes godliness to be blasphemed, and sixth, that we have not come to faith in Christ in order to be able to enjoy this or that but in order to be able to share in righteousness, which means in sinlessness, peace and joy.
[AD 407] John Chrysostom on Romans 9:22-23:24