And I will give them an heart to know me, that I am the LORD: and they shall be my people, and I will be their God: for they shall return unto me with their whole heart.
I will give them an heart to know me, that I am the Lord; and they shall be my people, and I ... their God (Jeremiah 30:22; Jeremiah 31:33-34; Jeremiah 32:38). Their conversion from idolatry to the one true God, through the chastening effect of the Babylonian captivity, is here expressed in language which, in its fullness, applies to the more complete conversion hereafter of the Jews, "with their whole heart" (Jeremiah 29:13), through the painful discipline of their present dispersion. The source of their conversion is here stated to be God's prevenient grace - "I will give them an heart to know me."
For they shall return unto me with their whole heart - repentance, though not the cause of pardon, is its invariable accompaniment: it is the effect of God's giving a heart to know Him.