(33) This shall be the covenant . . .--The prophet felt that nothing less than this would meet the wants of the time, or, indeed, of any time. The experiment, so to speak, of a law requiring righteousness had been tried and had failed. There remained the hope--now, by the Divine word that came to him, turned into an assurance--of a Power imparting righteousness, writing the "law in the inward parts," the centre of consciousness and will, in which God required truth (Psalm 2:6), in the heart as the region at once of thoughts and of affections. In 2Corinthians 3:3-6 we have a manifest reference not only to the idea, but to the very words of Jeremiah's prophecy.

Verse 33. - After those days; i.e. after they have fully come; not, after they are over. I will put my law, etc. Of course, not the Pentateuch, but the principles of which the rules in the Pentateuch were the temporary application. It is not here denied that there were, or might be, some under the Old Testament dispensation who had the Divine Law in their heart (see some of the psalms), but speaking of the people as a whole, it must be said that the Law was an external dictator rather than a bosom friend, a mechanical rule rather than a λόγος ἴμφυτος (James 1:21).

31:27-34 The people of God shall become numerous and prosperous. In Heb 8:8,9, this place is quoted as the sum of the covenant of grace made with believers in Jesus Christ. Not, I will give them a new law; for Christ came not to destroy the law, but to fulfil it; but the law shall be written in their hearts by the finger of the Spirit, as formerly written in the tables of stone. The Lord will, by his grace, make his people willing people in the day of his power. All shall know the Lord; all shall be welcome to the knowledge of God, and shall have the means of that knowledge. There shall be an outpouring of the Holy Spirit, at the time the gospel is published. No man shall finally perish, but for his own sins; none, who is willing to accept of Christ's salvation.But this shall be the covenant that I will make with the house of Israel; after those days, saith the Lord,.... The several articles or branches of the covenant next follow, which show it to be different from the former:

I will put my law in their inward parts, and write it in their hearts; not the ceremonial law, which was abolished when this covenant was made; but rather the moral law still in force, which is a transcript of the nature and will of God; was inscribed on Adam's heart in innocence; is greatly obliterated by sin; a contrary disposition to it is in man; this is reinscribed in regeneration; and hence a regard is had to it by regenerate persons, in which lies part of their conformity to Christ: or else, since the word here used signifies doctrine or instruction, the Gospel and the truths of it may be meant; see Isaiah 2:2, Romans 3:27; which have a place and dwell in the hearts of renewed ones. The Septuagint version reads it in the plural number, "laws"; and so does the apostle, Hebrews 8:10; and may design the ordinances of the Gospel, and the commandments of Christ; which such, who are called by grace, have at heart to keep, and are made willing to be subject to; besides, the principle of grace in the soul is called "the law of the mind"; Romans 7:23; it has the force of a law; is a reigning, governing, principle; and which is implanted in the genre by the spirit and power of God; the tables on which this law or laws are written are not tables of stone, but the fleshly tables of the heart; the heart is the proper seat, both of the law of God and Gospel of Christ, as well as of the grace of God in all regenerate persons: and the "putting" of those things there denotes knowledge of them, as of the spirituality of the law, and its perfection; that there is no righteousness by it, and is only fulfilled by Christ; and that it is a rule of walk and conversation; and also of the doctrines of the Gospel, in the power and savour of them, and of the ordinances of it, so as to practise them, and walk in them; and an experience of the truth and reality of internal grace: and "writing" them here may denote affection for, and subjection to, the above things; and a clear work of grace upon the soul, so as to be legible, and appear to be the epistle of Christ, written not with the ink of nature's power, but by the Spirit of the living God; see 2 Corinthians 3:3. This passage is applied to future times, the times of the Messiah, by the Jews (m):

and will be their God, and they shall be my people; God is the God of his covenant ones; not as the God of nature and providence only, but as the God of grace, and as their God and Father in Christ; which is preferable to everything else; all things are theirs; nor can they want any good thing; they need fear no enemy; they may depend upon the love of God, and be secure of his power; they may expect all blessings here and hereafter; for this covenant interest will always continue: and they are his people in such sense as others are not; a distinct, special, and peculiar people; a people near unto the Lord; high in his favour, and greatly blessed by him; all which is made to appear in their effectual calling; see 1 Peter 2:9.

(m) Shirhashirim Rabba, fol. 3. 2.