Matthew Henry Commentary Deuteronomy 30:11-14

"For this commandment which I command thee this day, it is not too hard for thee, neither is it far off. It is not in heaven, that thou shouldest say, Who shall go up for us to heaven, and bring it unto us, and make us to hear it, that we may do it? Neither is it beyond the sea, that thou shouldest say, Who shall go over the sea for us, and bring it unto us, and make us to hear it, that we may do it? But the word is very nigh unto thee, in thy mouth, and in thy heart, that thou mayest do it." — Deuteronomy 30:11-14 (ASV)

The law is not too high for you. It is not only known from afar; it is not confined to the learned. It is written in your books, made plain, so that one who runs may read it. It is in your mouth, in the language commonly used by you, in which you may hear it read and talk of it among your children. It is delivered so that it is level to the understanding of the humblest.

This is especially true of the gospel of Christ, to which the apostle applies it. But the word is near 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.