Verse 12. - They made their hearts as an adamant stone. They made their hearts as hard as a stone which could receive no cutting or engraving; no message from God could find entrance; and this from their wilful obstinacy. The word rendered "adamant," shamir, probably means "diamond," a stone so hard, says Jerome, as to break all metals to pieces, but to be itself broken by none; hence it is called adamas, "unconquerable." Ezekiel (Ezekiel 3:9) notes that it is harder than flint (comp. Jeremiah 17:1). The LXX., paraphrasing, gives. Τὴν καρδίαν αὐτῶν ἔταξαν ἀπειθῆ, "They set their heart disobedient." The Law. The various enactments of the Mosaic system. In his Spirit; rather, by his Spirit. The leaching which the Spirit of God inspired the prophets to deliver (comp. Nehemiah 9:30; 2 Kings 17:13; Micah 3:8). And for the succession of prophets from Solomon to the Captivity, see note on Amos 2:11; and to those there enumerated, add Iddo, Shemaiah, Hanani, Micaiah, Huldah.

7:8-14 God's judgements upon Israel of old for their sins, were written to warn Christians. The duties required are, not keeping fasts and offering sacrifices, but doing justly and loving mercy, which tend to the public welfare and peace. The law of God lays restraint upon the heart. But they filled their minds with prejudices against the word of God. Nothing is harder than the heart of a presumptuous sinner. See the fatal consequences of this to their fathers. Great sins against the Lord of hosts, bring great wrath from his power, which cannot be resisted. Sin, if regarded in the heart, will certainly spoil the success of prayer. The Lord always hears the cry of the broken-hearted penitent; yet all who die impenitent and unbelieving, will find no remedy or refuge from miseries which while here they despised and defied, but which they then will not be able to bear.Yea, they made their hearts as an adamant stone,.... The word here used is translated a "diamond" in Jeremiah 17:1 and it is said to be harder than a flint, Ezekiel 3:9. The Jewish writers say (g) it is a worm like a barley corn, so strong as to cut the hardest stones in pieces; Moses (they say) used it in hewing the stones for the two tables of the law, and in fitting the precious stones in the ephod; and Solomon in cutting the stones for the building of the temple; and is so hard that it cannot be broken by iron: and as hard is naturally the heart of man, and which becomes more so by sinning, and obstinate persisting in it, that nothing can remove the hardness of it but the powerful and efficacious grace of God: as hard as the adamant is, it is to be softened by the blood of a goat, as naturalists says (h); so the blood of Christ sprinkled on the heart, and a sense of forgiveness of sin by it, will soften the hardest heart:

lest they should hear the law, and the words which the Lord of hosts hath seat in his Spirit by the former prophets; the words of reproof, admonition, caution, and exhortation, which Jeremiah and others were sent to deliver to them, under the influence of the Spirit of God:

therefore came a great wrath from the Lord of hosts; which brought the Chaldeans upon them, who carried them captive into Babylon.

(g) Misn. Sota, c. 9. sect. 12. Pirke Abot. c. 5. sect. 5. & Maimon. & Bartenora in ib. Kimchi in 1 Reg. vi. 7. Jarchi in Isa. v. 6. (h) Pausan. Arcadica, sive l. 8. p. 485. Plin. Nat. Hist. l. 37. c. 4.