Jeremiah 18:6

Refuting the Jews' reliance on their external privileges as God's elect people, as if God could never cast them off. But if the potter, a mere creature, has power to throw away a marred vessel and raise up other clay from the ground, a fortiori God, the Creator, can east away the people who prove unfaithful to His election and can raise others in their stead (compare Isa 45:9; Isa 64:8; Rom 9:20-21). It is curious that the potter's field should have been the purchase made with the price of Judas' treachery (Mat 27:9-10 : a potter's vessel dashed to pieces, compare Psa 2:8-9; Rev 2:27), because of its failing to answer the maker's design, being the very image to depict God's sovereign power to give reprobates to destruction, not by caprice, but in the exercise of His righteous judgment. Matthew quotes Zechariah's words (Zac 11:12-13) as Jeremiah's because the latter (Jer. 18:1-19:15) was the source from which the former derived his summary in Zac 11:12-13 [HENGSTENBERG].

If that nation against whom I have pronounced,.... Such a sentence as this, should immediately, upon the above declaration, do as Nineveh did: turn from their evil; their evil of sin, their evil ways and works, as an evidence of the truth of their repentance for former sins: I will repent of the evil that one thought to do unto them; as they change their course of life, God will change the dispensations of his providence towards them, and not bring upon them the evil of punishment he threatened them with; in which sense repentance can only be understood of God, he doing that which is similar to what men do when they repent of anything; they stop their proceedings, and change their outward conduct; so God proceeds not to do what he threatened to do, and changes his outward behaviour to men; he wills a change, and makes one in his methods of acting, but never changes his will.

In Jer 18:6-10 the Lord discloses to the prophet the truth lying in the potter's treatment of the clay. The power the potter has over the clay to remould, according to his pleasure, the vessel he had formed from it if it went wrong; the same power God possesses over the people of Israel. This unlimited power of God over mankind is exercised according to man's conduct, not according to a decretum absolutum or unchangeable determination. If he pronounces a people's overthrow or ruin, and if that people turn from its wickedness, He repeals His decree (Jer 18:7.); and conversely, if He promises a people welfare and prosperity, and if that people turn away from Him to wickedness, then too He changes His resolve to do good to it (Jer 18:9.). Inasmuch as He is even now making His decree known by the mouth of the prophet, it follows that the accomplishment of Jeremiah's last utterances is conditioned by the impression God's word makes on men. רגע, adv., in the moment, forthwith, and when repeated = now...now, now...again. Ng. maintains that the arrangement here is paratactic, so that the רגע does not belong to the nearest verb, but to the main idea, i.e., to the apodosis in this case. The remark is just; but the word does not mean suddenly, but immediately, and the sense is: when I have spoken against a people, and this people repents, then immediately I let it repent me. נחם על as in Joe 2:13, etc. With "to pluck up," etc., "to build," etc., cf. Jer 1:10. "Against which I spake," Jer 18:8, belongs to "that people," and seems as if it might be dispensed with; but is not therefore spurious because the lxx have omitted it. For הרעה the Keri has הרע, the most usual form, Jer 7:30, Num 32:13; Jdg 2:11, etc.; but the Chet. is called for by the following הטּובה and מרעתו. להיטיב הטּו…

In this chapter we have, I. A general declaration of God's ways in dealing with nations and kingdoms, that he can easily do what he will with them, as easily as the potter can with the clay (Jer 18:1-6), but that he certainly will do what is just and fair with them. If he threaten their ruin, yet upon their repentance he will return in mercy to them, and, when he is coming towards them in mercy, nothing but their sin will stop the progress of his favours (Jer 18:7-10). II. A particular demonstration of the folly of the men of Judah and Jerusalem in departing from their God to idols, and so bringing ruin upon themselves notwithstanding the fair warnings given them and God's kind intentions towards them (Jer 18:11-17). III. The prophet's complaint to God of the base ingratitude and unreasonable malice of his enemies, persecutors, and slanderers, and his prayers against them (Jer 18:18-23).