Verse 1-7 — Observe the connexion of these two; Thou shalt love the Lord, and keep his charge. Love will work in obedience, and that only is acceptable obedience which flows from a principle of love, 1 John 5:3. Moses recounts some of the great and terrible works of God which their eyes had seen. What our eyes have seen, especially in our early days, should affect us, and make us better long afterwards.
Verse 8-17 — Moses sets before them, for the future, life and death, the blessing and the curse, according as they did or did not keep God's commandment. Sin tends to shorten the days of all men, and to shorten the days of a people's prosperity. God will bless them with an abundance of all good things, if they would love him and serve him. Godliness has the promise of the life that now is; but the favour of God shall put gladness into the heart, more than the increase of corn, and wine, and oil. Revolt from God to idols would certainly be their ruin. Take heed that your hearts be not deceived. All who forsake God to set their affection upon any creature, will find themselves wretchedly deceived, to their own destruction; and this will make it worse, that it was for want of taking heed.
Verse 18-25 — Let all be directed by the three rules here given. 1. Let our hearts be filled with the word of God. There will not be good practices in the life, unless there be good thoughts, good affections, and good principles in the heart. 2. Let our eyes be fixed upon the word of God, having constant regard to it as the guide of our way, as the rule of our work, Psalms 119:30. 3. Let our tongues be employed about the word of God. Nor will any thing do more to cause prosperity, and keeping up religion in a nation, than the good education of children.
Verse 26-32 — Moses sums up all the arguments for obedience in two words, the blessing and the curse. He charged the people to choose which they would have. Moses then appointed a public and solemn proclamation of the blessing and curse, to be made upon the two mountains of Gerizim and Ebal. We have broken the law, and are under its curse, without remedy from ourselves. In mercy, the gospel again sets before us a blessing and a curse. A blessing, if we obey the call to repentance, to faith in Christ, and newness of heart and life through him; an awful curse, if we neglect so great salvation. Let us thankfully welcome these glad tidings of great joy; and let us not harden our hearts, but hear this voice of God while it is called to-day, and while he invites us to come to him upon a mercy-seat. Let us be diligent to make our calling and election sure.