The people of God might be discouraged in their hopes of a restoration by the sense not only of their unworthiness of such a favour (which was answered, in the foregoing verses, with this, that God, in doing it, would have an eye to his own glory, not to their worthiness), but of their unfitness for such a favour, being still corrupt and sinful; and that is answered in these verses, with a promise that God would by his grace prepare and qualify them for the mercy and then bestow it on them. And this was in part fulfilled in that wonderful effect which the captivity in Babylon had upon the Jews there, that it effectually cured them of their inclination to idolatry. But it is further intended as a draught of the covenant of grace, and a specimen of those spiritual blessings with which we are blessed in heavenly things by that covenant. As (ch. xxxiv.) after a promise of their return the prophecy insensibly slid into a promise of the coming of Christ, the great Shepherd, so here it insensibly slides into a promise of the Spirit, and his gracious influences and operations, which we have as much need of for our sanctification as we have of Christ's merit for our justification.