4:1-23 The power and love of God to Israel are here made the ground and reason of a number of cautions and serious warnings; and although there is much reference to their national covenant, yet all may be applied to those who live under the gospel. What are laws made for but to be observed and obeyed? Our obedience as individuals cannot merit salvation; but it is the only evidence that we are partakers of the gift of God, which is eternal life through Jesus Christ, Considering how many temptations we are compassed with, and what corrupt desires we have in our bosoms, we have great need to keep our hearts with all diligence. Those cannot walk aright, who walk carelessly. Moses charges particularly to take heed of the sin of idolatry. He shows how weak the temptation would be to those who thought aright; for these pretended gods, the sun, moon, and stars, were only blessings which the Lord their God had imparted to all nations. It is absurd to worship them; shall we serve those that were made to serve us? Take heed lest ye forget the covenant of the Lord your God. We must take heed lest at any time we forget our religion. Care, caution, and watchfulness, are helps against a bad memory.
7-9. what nation is there so great—Here he represents their privileges and their duty in such significant and comprehensive terms, as were peculiarly calculated to arrest their attention and engage their interest. The former, their national advantages, are described (De 4:7, 8), and they were twofold: 1. God's readiness to hear and aid them at all times; and 2. the excellence of that religion in which they were instructed, set forth in the "statutes and judgments so righteous" which the law of Moses contained. Their duty corresponding to these pre-eminent advantages as a people, was also twofold: 1. their own faithful obedience to that law; and 2. their obligation to imbue the minds of the young and rising generation with similar sentiments of reverence and respect for it.