Jeremiah 31:33

“the letter killeth,”

etc. By “letter” he means not what Origen foolishly explained, for he perverted that passage as he did almost the whole Scripture: Paul does not mean there the simple and plain sense of the Law; for he calls it the letter for another reason, because it only sets before the eyes of men what is right, and sounds it also in their ears. And the word letter refers to what is written, as though he had said, The Law was written on stones, and was therefore a letter. But the Gospel — what is it? It is spirit, that is, God not only addresses his word to the ears of men and sets it before their eyes, but he also inwardly teaches their hearts and minds. This is then the solution of the question: the Prophet speaks of the Law in itself, as apart from the Gospel, for the Law then is dead and destitute of the Spirit of regeneration.

He afterwards says, I will put my Law in their inward parts By these words he confirms what we have said, that the newness, which he before mentioned, was not so as to the substance, but as to the form only: for God does not say here, “I will give you another Law,” but I will write my Law, that is, the same Law, which had formerly been delivered to the Fathers. He then does not promise anything different as to the essence of the doctrine, but he makes the difference to be in the form only. But he states the same thing in two ways, and says, that he would put his law in their inward parts, and that he would write it in their hearts We indeed know how difficult it is that man should be so formed to obedience that his whole life may be in unison with the Law of God, for all the lusts of the flesh are so many enemies, as Paul says, who fight against God. (Romans 8:7) As then all our affections and lusts thus carry on war with God, it is in a manner a renovation of the world when men suffer themselves to be ruled by God. And we know what Scripture says, that we cannot be the disciples of Christ, except we renounce ourselves and the world, and deny our own selves. (Matthew 6:24; Luke 14:26, 27) This is the reason why the Prophet was not satisfied with one statement, but said, I will put my Law in their inward parts, I will write it in their hearts.

We may further learn from this passage, how foolish the Papists are in their conceit about free-will. They indeed allow that without the help of God’s grace we are not capable of fulfilling the Law, and thus they concede something to the aid of grace and of the Spirit: but still they not only imagine a co-operation as to free-will, but ascribe to it the main work. Now the Prophet here testifies that it is the peculiar work of God to write his Law in our hearts. Since God then declares that this favor is justly his, and claims to himself the glory of it, how great must be the arrogance of men to appropriate this to themselves? To write the Law in the heart imports nothing less than so to form it, that the Law should rule there, and that there should be no feeling of the heart, not conformable and not consenting to its doctrine. It is hence then sufficiently clear, that no one can be turned so as to obey the Law, until he be regenerated by the Spirit of God; nay, that there is no inclination in man to act rightly, except God prepares his heart by his grace; in a word, that the doctrine of the letter is always dead, until God vivifies it by his Spirit.

He adds, And I will be to them a God, and they shall be to me a people Here God comprehends generally the substance of his covenant; for what is the design of the Law, except that the people should call upon him, and that he should also exercise a care over his people? For whenever God declares that he will be our God, he offers to us his paternal layout, and declares that our salvation is become the object of his care; he gives to us a free access to himself, bids us to recumb on his grace, and, in short, this promise contains in itself everything needful for our salvation. The case is now also at this day the same under the Gospel; for as we are aliens from the kingdom of heaven, he reconciles us by it to himself, and testifies that he will be our God. On this depends what follows, And they shall be my people; for the one cannot be separated from the other. By these words then the Prophet briefly intimates, that the main object of God’s covenant is, that he should become our Father, from whom we are to seek and expect salvation, and that we should also become his people. Of these things there is more to be said again; but I have explained the reason why I now so quickly pass over things worthy of a longer explanation. He adds, —