Heb 8:10

“Having bestowed on us the truly great, divine, and inalienable inheritance of the Father, deifying man by heavenly teaching, putting His laws into our minds, and writing them on our hearts. What laws does He inscribe? "That all shall know God, from small to great;" and, "I will be merciful to them," says God, "and will not remember their sins." Let us receive the laws of life, let us comply with God's expostulations; let us become acquainted with Him, that He may be gracious. And though God needs nothing let us render to Him the grateful recompense of a thankful heart and of piety, as a kind of house-rent for our dwelling here below.”

“"For this," he says, "is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put My laws into their mind, and write them in their hearts, and I will be to them a God, and they shall be to Me a people." Thus He says this concerning the New covenant because His words are "not according to the covenant which I covenanted." But what other difference is there beside this? Now if any person should say that "the difference is not in this respect, but in respect to its being put into their hearts; He makes no mention of any difference of ordinances, but points out the mode of its being given: for no longer" (he says) "shall the covenant be in writings, but in hearts;" let the Jew in that case show that this was ever carried into effect; but he could not, for it was made a second time in writings after the return from Babylon. But I show that the Apostles received nothing in writing, but received it in their hearts through the Holy Ghost. Wherefore also Christ said, "When He cometh, He will bring all things to your remembrance, and He shall teach you." (John xiv. 26.)”

“"After those days": which ones? Some say these are the days of the exodus, when the Mosaic law was given. But it seems to me that he is speaking of those days about which he said above: "behold, the days are coming." Thus, after those days have passed, I will establish such a covenant, about which you will hear further. Let the Jew show when he received the unwritten law. For even after the return from Babylon, it was given by Ezra in written form. But the Apostles received nothing in written form; rather, they received the law of the Spirit into their hearts. Therefore Christ also said: "The Comforter... will teach you all things and bring all things to your remembrance" (Cf. Jn. 14:26). This was accomplished through the Gospel. For those who formerly served idols, having now recognized the true God, became His people.”

“God proposes the most direct norms. Hence, the Apostle and Jeremiah say: "I will put my laws into their mind, and upon their hearts I will write them." For He inscribed them first in human nature, then in industry or progress, third in grace, and fourth in glory. In every state, He puts forth His rules: wherefore by necessity He must possess them within Himself.”

“403. – Then (v. 10) he describes the qualities of the New Testament. In regard to this he does two things: first, he describes the way it was announced; secondly, its effect (v. 10b). 404. – He says, therefore, This is the covenant that I will make with the house of Israel after those days. Making implies a suitable order; hence, he says, after those days, i.e., after the Law was given. For a new law should have been given after the old; just as a master is given after a pedagogue, in order that man recognize his infirmity. This, therefore, shows the fitness of the time when the New Testament was given. The manner in which it was given is twofold: in one way by externals, by proposing words suited to their understanding. This man can do; and that is the way the Old Testament was given. In another way by acting inwardly, and this is peculiar to God: 'the inspiration of the Almighty gives understanding' (Jb. 32:8). This is the way the New Testament was given, because it consists in the outpouring of the Holy Spirit, Who instructs inwardly. But it is not enough to know, for one must act. Therefore, He first enlightens the intellect to understand; hence, he says, I will put my laws into their minds. He uses the plural, because there are various precepts and counsel. This the Holy Spirit does: 'His unction teaches you' (1 Jn. 2:27); 'He will teach you all things (Jn. 14:26). Furthermore, He inclines the will to act well; hence, it is impressed on their heart. In regard to this he says, and write them on their hearts, i.e., I will write charity on their knowledge: 'Above all things have charity, which is the bond of perfection' (Col. 3:14); 'The charity of God is poured forth in our hearts by the Holy Spirit who is given to us' (Rom. 5:5). This is the epistle of which he says in 2 Cor. (3:3): 'Not in ink, but with the Spirit of the living God; not in tablets of stone, but in the fleshly tablets of the heart.' 405. – Having mentioned the qualities of the New Testament from the way it was given, the Apostle now describes three of its effects: the first is man's perfect union with God; the second is perfect knowledge of God (v. 11); the third is the remission of sins (v. 12). 406. – In regard to the first it should be noted that the help of God's grace is required, if man is to be united with God, because one's own power is not capable of this: 'I have loved you with an everlasting love; therefore, have I drawn you, taking pity on you' (Jer. 31:3): first, therefore, he touches on that union from God's side; secondly, from mans' side (v. 10c). He says, therefore: I will be their God. Now the name 'God' signifies universal providence. Therefore, He is our God, when He has a care for us and draws our hearts to Himself. Therefore, from the fact that he says, I will be their God, the effect follows that they shall be my people, i.e., they will show themselves my people. For, as Augustine says in The City of God: A people is an assembled multitude joined together by the consent of right and common utility. Therefore, when they consent to the rights of the divine law in order to be useful to each other and tend to God, then they are God's people: 'And they shall be his people; and God himself with them shall be their God' (Rev. 21:3).”

“For this is the testament which I will make with the house of Israel, and with all nations, as I promised to Abraham, I will give (literally, by giving) my laws into their mind, and I will write this new law, not as the former, in tables of stone, but in their hearts, and to them I will be a merciful God, and they shall be my elect people. (Witham) — The Jews were like slaves, and God ruled them as a master; Christians are his children, and God rules them as a father: and so great is the efficacy of this divine teacher, that by means of a short and easy catechism, children are now taught to know God more perfectly than the first sages of antiquity by their abstruse and erudite disquisitions. We moreover observe under the new law the grace and spirit of love, engrafted in the hearts of the faithful by the Holy Ghost working in the sacraments and sacrifice of the new law to that effect….This covenant was made at the last supper, and ratified the next day by the death of the Testator on the cross, when he exclaimed, “consummatum est,” all is consummated. [John xix. 30.]”

“make with--Greek, "make unto." Israel--comprising the before disunited (Heb 8:8) ten tribes' kingdom, and that of Judah. They are united in the spiritual Israel, the elect Church, now: they shall be so in the literal restored kingdom of Israel to come. I will put--literally, "(I) giving." This is the first of the "better promises" (Heb 8:6). mind--their intelligent faculty. in, &c.--rather, " ON their hearts." Not on tables of stone as the law (Co2 3:3). write--Greek, "inscribe." and I will be to them a God, &c.--fulfilled first in the outward kingdom of God. Next, in the inward Gospel kingdom. Thirdly, in the kingdom at once outward and inward, the spiritual being manifested outwardly (Rev 21:3). Compare a similar progression as to the priesthood (1) Exo 19:6; (2) Pe1 2:5; (3) Isa 61:6; Rev 1:6. This progressive advance of the significance of the Old Testament institutions, &c., says THOLUCK, shows the transparency and prophetic character which runs throughout the whole.”

“"For this is the covenant." Which one? The New one. That is to say, "after those days." Which days? Some say, those of the Exodus, in which the Mosaic law was given; but it seems to me that it speaks of those days mentioned above: "Behold, the days are coming." After those days have passed, I will make such a covenant as you will hear next. "I will put my laws." I will establish, giving my laws, "on their hearts." For neither in letters was the new established, but through the Holy Spirit. And this is indicated by Christ speaking to the apostles. "He (that is, the Comforter) coming, will remind you and teach you all things." (Jn. 14:26) Do you see that the new is not in letters, but through the Holy Spirit? Therefore, consider how much greater the New Covenant is. "And I will be their God." This was accomplished through the gospel. For those who formerly worshiped idols, now having known the true God, have become His people.”