20. Thou wilt perform the truth to Jacob, and the mercy to Abraham, which thou hast sworn unto our fathers from the days of old.

20. Dabis veritatem Jacob, misericordiam Abrahae, quas jurasti patribus nostris a diebus antiquis.

The faithful confirm here the former truth, that God had deposited his covenant with them, which could not be made void: and hence also shines forth more clearly what I have said before, that the faithful do not learn by their own understanding what sort of Being God is, but embrace the mercy which he offers in his own word. Except God then speaks, we cannot form in our own minds any idea of his grace but what is uncertain and vanishing; but when he declares that he will be merciful to us, then every doubt is removed. This is now the course which the Prophet pursues.

He says, Thou wilt give truth to Jacob, mercy to Abraham, which thou hast sworn to our fathers; as though he said, "We do not presumptuously invent any thing out of our own minds, but receive what thou hast once testified to us; for thy will has been made known to us in thy word: relying then on thy favor, we are persuaded as to thy gratuitous pardon, though we are in many respects guilty before thee." We now then understand the design of the Prophet.

As to the words, it is not necessary to dwell on them, for we have elsewhere explained this form of speaking. There are here two expressions by which the Prophet characterizes the covenant of God. Truth is mentioned, and mercy is mentioned. With respect to order, the mercy of God precedes; for he is not induced otherwise to adopt us than through his goodness alone: but as God of his own will has with so great kindness received us, so he is true and faithful in his covenant. If then we desire to know the character of God's covenant, by which he formerly chose the Jews, and at this day adopts us as his people, these two things must be understood, that God freely offers himself to us, and that he is constant and true, he repents not, as Paul says, as to his covenant: The gifts and calling of God, he says, are without repentance, (Romans 11:29;) and he refers to the covenant, by which God adopted the children of Abraham.

He says now, Thou wilt give, that is, show in reality; for this, to give, is, as it were, to exhibit in effect or really. Thou will then give, that is, openly show, that thou hast not been in vain so kind to us and ours, in receiving them into favor. How so? Because the effect of thy goodness and truth appears to us.

Thou hast then sworn to our fathers from the days of old. The faithful take for granted that God had promised to the fathers that his covenant would be perpetual; for he did not only say to Abraham, I will be thy God, but he also added, and of thy seed for ever. Since, then, the faithful knew that the covenant of God was to be perpetual and inviolable, and also knew that it was to be continued from the fathers to their children, and that it was once promulgated for this end, that the fathers might deliver it as by the hand to their children; they therefore doubted not but that it would be perpetual. How so? for thou hast sworn to our fathers; that is, they knew that God not only promised, but that having interposed an oath, by which God designed to confirm that covenant, he greatly honored it, that it might be unhesitatingly received by the chosen people. As then the faithful knew that God in a manner bound himself to them, they confidently solicited him, really to show himself to be such as he had declared he would be to his own elect.