Deuteronomy 11:18

18.Therefore shall ye lay up these my words. He again demands their serious attention, lest if the doctrine he propounds should be only lightly and carelessly received, it should speedily be let slip; for to lay up in, or on, the heart, is the same as to hide deeply in it; although, where the word “soul” is added, the “heart” refers to the mind, or the intellectual faculties. In fine, he commands them to have the Law not only impressed on the mind, but embraced with sincere affection. In the next place, he commands that aid to the memory which we have just considered, viz., that they should wear the precepts on the arms and foreheads; as if God should constantly meet them, to arouse their senses. For (as has been said) God had no regard to the bands themselves, but would have them seen on their arms and foreheads for another object, viz., (236) to suggest and renew their care for religion. Again, He appointed them to occupy the place of ornaments, in order to accustom the people to take their chief delight in meditating on the Law. Thus that foolish ambition is sufficiently refuted, when hypocrites sought after a reputation for holiness by their fringes and other fopperies, as well as that gross error of the whole people, in thinking that they discharged their duty to God by their outward dress. What follows afterwards, that the precepts should be written on the gates of their cities, and on their private houses, tends to the same thing; for we have said, that since men’s minds are prone to vanity, and are easily distracted by innumerable allurements, they have need of such stays to hold them back. And this object is plainly expressed, when He commands them severally to speak of the precepts of the Law, whether they are sitting at home, or going abroad, or lying down, or rising up; because without diligent exercise, it usually happens that whatever men have once learnt is soon lost. He adds, also, another effect of this diligence, viz., that not only should each of them consult their own individual advantage, but also teach their children, whereby God’s Law would ever be maintained in rigor by perpetual succession.