In thy mouth, and in, thy heart - Compare Deuteronomy 6:6; Deuteronomy 11:18-20.

But the word is very nigh unto thee - The doctrine of salvation preached by the apostles; in thy mouth, the promises of redemption made by the prophets forming a part of every Jew's creed; in thy heart - the power to believe with the heart unto righteousness, that the tongue may make confession unto salvation. In this way, it is evident, St. Paul understood these passages; see Romans 10:6-8, etc.

But the word is very nigh unto thee,.... In the ministration of it by those who clearly, plainly, and faithfully preach it, and in the application of it by the Spirit of God to the heart; and in the gracious experience converted persons have of the power and efficacy of it in them, and of the comfort they receive from it:

in thy mouth, and in thy heart, that thou mayest do it; in the mouth by confession, being not ashamed to own it, and profess it before men; and in the heart, where it is come with power, has a place, and works effectually, and is cordially believed, and comfortably experienced; and when this is the case, its ordinances will be faithfully kept as delivered, and cheerfully submitted to.

But the {k} word is very nigh unto thee, in thy mouth, and in thy heart, that thou mayest {l} do it.

(k) Even the law and the gospel.

(l) By faith in Christ.

30:14 In thy mouth - Thou knowest it so well, that it is the matter of thy common discourse. In thy heart - In thy mind, (as the heart is very commonly taken) to understand and believe it. In a word, the Law is plain and easy: but the gospel is much more so.

30:11-14 The law is not too high for thee. It is not only known afar off; it is not confined to men of learning. It is written in thy books, made plain, so that he who runs may read it. It is in thy mouth, in the tongue commonly used by thee, in which thou mayest hear it read, and talk of it among thy children. It is delivered so that it is level to the understanding of the meanest. This is especially true of the gospel of Christ, to which the apostle applies it. But the word is nigh us, and Christ in that word; so that if we believe with the heart, that the promises of the Messiah are fulfilled in our Lord Jesus, and confess them with our mouth, we then have Christ with us.