Jamieson, Fausset and Brown on Deuteronomy 30:11-14

De 30:11-14. The Commandment Is Manifest.

11-14. For this commandment ... is not hidden ... neither is it far off--That law of loving and obeying God, which was the subject of Moses' discourse, was well known to the Israelites. They could not plead ignorance of its existence and requirements. It was not concealed as an impenetrable mystery in heaven, for it had been revealed; nor was it carefully withheld from the people as a dangerous discovery; for the youngest and humblest of them were instructed in those truths, which were subjects of earnest study and research among the wisest and greatest of other nations. They were not under a necessity of undertaking long journeys or distant voyages, as many ancient sages did in quest of knowledge. They enjoyed the peculiar privilege of a familiar acquaintance with it. It was with them a subject of common conversation, engraven on their memories, and frequently explained and inculcated on their hearts. The apostle Paul (Ro 10:6-8) has applied this passage to the Gospel, for the law of Christ is substantially the same as that of Moses, only exhibited more clearly in its spiritual nature and extensive application; and, accompanied with the advantages of Gospel grace, it is practicable and easy.