Thus we see how all Scripture is in perfect harmony with the exhortation recorded in our chapter, "And these words which I command thee this day, shall be in thine heart." How near this would have kept them to their covenant-God! How safe, too, from all evil, and specially from the abominable evil of idolatry--their national sin, their terrible besetment! If Jehovah's precious words had only found their right place in the heart, there would have been little fear of Baal, Chemosh, or Ashtaroth. In a word, all the idols of the heathen would have found their right place, and been estimated at their true value, if only the word of Jehovah had been allowed to dwell in Israel's heart. And be it specially noted here how beautifully characteristic all this is of the book of Deuteronomy. It is not so much a question of keeping up a certain order of religious observances, the offering of sacrifices, or attention to rites and ceremonies. All these things, no doubt, had their place, but they are by no means the prominent or paramount thing in Deuteronomy. No; THE WORD is the all-important matter here. It is _Jehovah's word_ in _Israel's heart_. The reader must seize this fact if he really desires to possess the key to the lovely book of Deuteronomy. It is not a book of ceremonial; it is a book of moral and affectionate obedience. It teaches, in almost every section, that invaluable lesson, that the heart that loves, prizes, and honors the Word of God is ready for every act of obedience, whether it be the offering of a sacrifice or the observance of a day. It might so happen that an Israelite would find himself in a place and under circumstances in which a rigid adherence to rites and ceremonies would be impossible; but he never could be in a place or in circumstances in which he could not love, reverence, and obey the Word of God. Let him go where he would--let him be carried, as a captive exile, to the ends of the earth, nothing could rob him of the high privilege of uttering and acting on those blessed words, "Thy Word have I hid in mine heart, that I might not sin against Thee."