13 'And it hath been—if thou hearken diligently unto My commands which I am commanding you to-day, to love Jehovah your God, and to serve Him with all your heart, and with all your soul— 14 that I have given the rain of your land in its season—sprinkling and gathered—and thou hast gathered thy corn, and thy new wine, and thine oil, 15 and I have given herbs in thy field for thy cattle, and thou hast eaten, and been satisfied. 16 'Take heed to yourselves, lest your heart be enticed, and ye have turned aside, and served other gods, and bowed yourselves to them, 17 and the anger of Jehovah hath burned against you, and He hath restrained the heavens, and there is no rain, and the ground doth not give her increase, and ye have perished hastily from off the good land which Jehovah is giving to you.

18 'And ye have placed these my words on your heart, and on your soul, and have bound them for a sign on your hand, and they have been for frontlets between your eyes; 19 and ye have taught them to your sons, by speaking of them in thy sitting in thy house, and in thy going in the way, and in thy lying down, and in thy rising up, 20 and hast written them on the side-posts of thy house, and on thy gates, 21 so that your days are multiplied, and the days of your sons, on the ground which Jehovah hath sworn to your fathers to give to them, as the days of the heavens on the earth.

Matthew Henry's Commentary on Deuteronomy 11:13-21

Commentary on Deuteronomy 11:8-17

(Read Deuteronomy 11:8-17)

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.

Commentary on Deuteronomy 11:18-25

(Read Deuteronomy 11:18-25)

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, Psalm 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.