The Prophet here confirms his former teaching, namely, that although the Jews rendered God's covenant vain as far as they possibly could, yet it should be firm and fixed. But we must hold what I have mentioned, that this discourse is specially limited to the elect, because the safety of the whole people was already desperate. Hence God shows that the covenant which he had made with Abraham could not be abolished by the, perfidy of man. And this is what Paul says in the third chapter of the Epistle to the Romans, (Romans 3:4,) Even if the whole world were liars, yet God must always remain true. But we see that the covenant of which we are now teaching was new, and yet had its origin from the old, because we are so reconciled to God by Christ that we ought to be grafted into the body of the ancient Church, and be made sons of Abraham, since, as we saw before, he is not called the father of the faithful in vain. God says, therefore, that his own covenant should be firm with the people, not with that people which had been already deserted through its perfidy, but with the true and genuine children of Abraham, who followed their father in faith and piety, as it is said in the 102d Psalm, (Psalm 102:18,) A people shall be created to the praise of God. For the Prophet now shows that God's covenant could not be otherwise constituted afresh unless a new Church were formed, and God was to create a new world: for this is the meaning of the words, A people when created shall praise God. The Spirit, therefore, obliquely reproves the Israelites, as if he had said that the praises of God were abolished among them: but when the new people shall come forth, then God should be glorified. He adds, and you shall know that I am Jehovah. This phrase is often repeated, but in a different sense. For when a prophet threatened the people, he always added this particle, and thus a contrast must be understood between the people's stupidity and good sense; for all their prophecies were neglected by the people. God's servants indeed uttered their voice, and severely blamed the impious and wicked, but without any effect. Since, therefore, they so wantonly played with reproaches and threats, it was often said to them, You shall begin to feel me to be God when I shall cease to speak to you, and shall instruct you by scourges. But now the Prophet, as we see, preaches concerning the gratuitous reconciliation of the people with God. Hence they really felt him to be God, because he stood firm to his promises, although, through the fault of man, his covenant had fallen to pieces and become invalid. The Prophet here announces that they should feel God to be unlike themselves, that is, not to change his counsels, or to vary with the levity and inconstancy of men: as also it is said in Isaiah, My thoughts are not as your thoughts: as far as the heavens are distant from the earth, so are my thoughts distant from yours, and my ways from your ways. (Isaiah 55:8,9.) God here means that the Jews acted wrong in estimating his pity by their own common sense: for he says that he differed very much from them, since his pity was unfathomable, and his truth incomprehensible. Now, therefore, we understand what the Prophet means in this verse. In the first clause he pronounces, that the covenant which God would make with his new and elect people should be firm: then he adds, that the Jews should know that they were dealing with God, because they could not take away what God was then promising. Now we can understand the reason why God's covenant in Christ was perpetual: because, as we read in Jeremiah, he inscribed his law on the hearts of the righteous, and remitted their iniquities. (Jeremiah 31:33.) This, then, was the cause of its perpetuity. Besides, although the Prophet magnifies God's grace in the second clause, yet at the same time he recalls the Jews from every perverse imagination which might entirely shake their confidence. For when they thought themselves plunged in an abyss, they were ready to collect that there was no further remedy. But if God wished to preserve them, why did he not send them help in time? But when he suffered them to be led into exile, and to be plunged into the lowest depths, there was no hope of restoration. For this cause Ezekiel announces that the faithful ought not to persist in their own thoughts, but rather to raise their minds to heaven, and to expect what seemed altogether out of place, since they thought to judge according to the nature of God, and to measure the effects of his promises by the immensity of his power rather than by their own perceptions.

And I will establish my covenant with thee,.... See Gill on Ezekiel 16:60; and which is repeated for the comfort of the Lord's people, being ashamed upon the remembrance of their evil ways; and to show the certainty of it, as well as because it is a matter of the greatest importance:
and thou shalt know that I am the Lord; a covenant keeping God; true and faithful to my promises, and able to make them good: this is a principal blessing of the covenant of grace, to know the Lord, Jeremiah 31:34.

(Hosea 2:19-20).
thou shalt know that I am the Lord--not, as elsewhere, by the judgments falling on thee, but by My so marvellously restoring thee through grace.