(2.) Their practices shall be consonant to those principles: I will give them a new spirit, not that they may be able to discourse well of religion and to dispute for it, but that they may walk in my statues in their whole conversation and keep my ordinances in all acts of religious worship, v. 20. These two must go together; and those to whom God has given a new heart and a new spirit will make conscience of both; and then they shall be my people and I will be their God. The ancient covenant, which seemed to be broken and forgotten, shall be renewed. By their idolatry, it should seem, they had cast God off; by their captivity, it should seem, God had cast them off. But when they were cured of their idolatry, and delivered out of their captivity, God and his Israel own one another again. God, by his good work in them, will make them his people; and then, by the tokens of his good-will towards them, he will show that he is their God.