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.

29. In those days—after their punishment has been completed, and mercy again visits them.

fathers … eaten … sour grape … children's teeth … on edge—the proverb among the exiles' children born in Babylon, to express that they suffered the evil consequences of their fathers' sins rather than of their own (La 5:7; Eze 18:2, 3).