Romans 11:4

And do you wish to see that not by me, but by the Apostle these things are expounded as being about us? Hear himself what he says: "but in Elijah what does the Scripture say, how he pleads with God against Israel? Lord, they have killed your prophets, they have torn down your altars, and I am left alone, and they seek my life. But what does the divine answer say to him? I have left for myself seven thousand men, who have not bent the knee to Baal" — and he adds: "so therefore", he says, "also at this present time a remnant according to the election of grace has been made safe". You see, then, that those who "bent the knee to the Baalim" and "those who did not bend it" he interprets of the remnant of believers and of the multitude of unbelievers. And this he shows: that those who in the time of the Savior proved unbelieving and impious "bent the knee to the Baalim" and adored idols, but those who believe and fulfill the works of faith "did not bend the knee to the Baalim".

And when Elijah made this lament before God, hear what the divine oracles answer him: "I have left for myself seven thousand men who have not bowed their knees to Baal." Baal is the name of an idol, to whose worship that people had fallen away, having abandoned the law of God. But let us see what the very number of seven thousand men indicates. The number seven pertains to rest. For "on the seventh day God rested." Hear then also how Christ invites those who believe in him to rest, and says: "Come to me, all you who labor and are burdened; and you shall find rest for your souls." To this number seven, therefore, belongs everyone who, coming to Christ, has laid down the burdens of sin and found the rest of salvation.

Nor did Samuel, who had done so many surprising things, disregard David the beloved of God: yet they were both prophets, and the one was high priest, and the other was king. And when there were only seven thousand holy men in Israel who had not bowed the knee to Baal, Elijah alone among them, and his disciple Elisha, were workers of miracles. Yet neither did Elijah despise Obadiah the steward, who feared God, but wrought no signs; nor did Elisha despise his own disciple when he trembled at the enemies. Moreover, neither did the wise Daniel who was twice delivered from the mouths of the lions, nor the three children who were delivered from the furnace of fire, despise the rest of their fellow-Israelites: for they knew that they had not escaped these terrible miseries by their own might; but by the power of God did they both work miracles, and were delivered from miseries. Wherefore let none of you exalt himself against his brother, though he be a prophet, or though he be a worker of miracles: for if it happens that there be no longer an unbeliever, all the power of signs will thenceforwards be superfluous. For to be pious is from any one's good disposition; but to work wonders is from the power of Him that works them by us...

This is clear, for Paul shows that not only Elijah remained as one devoted to God who did not worship idols, but that there were many who remained faithful to God, just as there were not a few Jews who believed in Christ.

"He hath not cast off His people, whom He foreknew."

As though he said, I have with me three, five, or ten thousand. What then? has the people come to be three, five, or ten thousand? that seed that compared with the stars of heaven for multitude, or the sand of the sea? Is this the way you deceive us and put a cheat upon us, by making the whole people thyself and the few that are with thee; and didst thou inflate us with idle hopes, and say that the promise has been fulfilled, when all are lost, and the salvation comes down to a few? This is all bombast and vanity! we cannot away with such sophistry as this. Now, that they may not say this, see how in the sequel he proceeds to the answer, not giving the objection indeed, but before it grounding the answer to it upon ancient history. What then is the answer?

"Wot ye not," he says, "what the Scripture saith of Elias? how he maketh intercession to God against Israel, saying, Lord, they have killed Thy prophets, and digged down Thine altars; and I am left alone, and they seek my life. But what saith the answer of God unto him? I have reserved to Myself seven thousand men, who have not bowed the knee to the image of Baal. Even so then at this present time also, there is a remnant according to the election of grace."

What he means is nearly this. "God hath not cast off His people." For had He done so, He would have admitted none of them. But if He did admit some, He hath not cast them off. Still it is said, if He had not cast off, He would have admitted all. This does not follow; since in Elijah's time the part to be saved had come down to "seven thousand:" and now also there are probably many that believe. But if you do not know who they are, this is no wonder, for that prophet, who was so great and good a man, did not know. But God ordered things for Himself when even the prophet knew them not. But consider his judgment. Now in proving what was before him, he covertly augments the charge against them. For this is why he gave the whole passage, that he might parade before them their untowardness, and show that they had been so from of old. For if he had not wished this, but had directed his whole attention to prove that the people lay in the few, he would have said that even in Elijah's time, seven thousand were left. But now he reads to them the passage further back, as having been throughout at pains to show that it was no strange thing that they did with Christ, and the Apostles, but their habitual practice. For to prevent their saying that it was as a deceiver we put Christ to death, and as impostors that we persecute the Apostles, he brings forward the text which says, "Lord, they have killed Thy prophets, and digged down thine altars." Then in order not to make his discourse galling to them, he attaches another reason to the bringing forward of the text. For he quotes it not as if it was on purpose to accuse them, but as if intent upon showing some other things. And he leaves them without any excuse even by what had before been done.

If so many men were hidden from the prophet, how much more are you unaware of how many Jews have been saved and are to be saved!

Elijah did not know about these 7, until God revealed their existence to him. So it is not unbelievable that you too are ignorant of how many Jews have believed in the Savior.

The Apostle could have been objected to: what are you saying, Paul? Do you really consider the people who are likened to sand and stars to consist of three thousand, five thousand, a great multitude of people? Therefore he says: even in the time of Elijah no more than seven thousand were saved; and even Elijah did not know them. And now, probably, there are many who have believed. If you do not know them, this is nothing new: Elijah too did not know those. At the same time, imperceptibly touching upon another subject with his words, he shows that the murder they committed was long ago foretold from above. Namely: lest they should say, we killed Christ as a deceiver, he asks: then how did your forefathers kill the Old Testament prophets? Were they too deceivers? They boldly caused grief? But how then did your forefathers dig up the altars? Did the altars too give offense? And how did they seek to kill Elijah himself, who was zealous for the Jews and renowned for his miracles? But if in those times, when there were so many wicked people, the Lord chose for Himself only seven thousand, as Scripture shows, that is, the revelation and word of God, then there is nothing at all new if He now too chooses only the worthy. He explains this further as well.

Then when he says but what does, he gives the divine reply, saying: but what does the divine answer say to him, i.e., to Elijah. It is this: I have left me, i.e., for my worship by not permitting them to fall into sin, seven thousand men (this definite number is put in place of the uncertain number, because seven and thousand are perfect numbers), that have not bowed their knees to Baal, i.e., who have not abandoned the worship of God: all who call on my name, whom I created for my glory (Isa 43:17).