God's answer discovers the purposes of his wrath against that generation of the Jews, and the purposes of his grace concerning future generations. It is sin, and nothing else, that ruins them. The restoration of Judah and Jerusalem is promised.
This people were now at length brought to despair. But God gives hope of mercy which he had in store for them hereafter. Doubtless the promises are sure to all believers. God will own them for his, and he will prove himself theirs.
He will give them a heart to fear him. All true Christians shall have a disposition to mutual love. Though they may have different views about lesser things, they shall all be one in the great things of God; in their views of the evil of sin, and the low estate of fallen man, the way of salvation through the Saviour, the nature of true holiness, the vanity of the world, and the importance of eternal things.
Whom God loves, he loves to the end. We have no reason to distrust God's faithfulness and constancy, but only our own hearts. He will settle them again in Canaan. These promises shall surely be performed.
Jeremiah's purchase was the pledge of many a purchase that should be made after the captivity; and those inheritances are but faint resemblances of the possessions in the heavenly Canaan, which are kept for all who have God's fear in their hearts, and do not depart from him.
Let us then bear up under our trials, assured we shall obtain all the good he has promised us.