We shall now proceed with our chapter.
Moses having laid down the grand foundation-truth contained in the fourth verse—"Hear, O Israel; the Lord our God is one Lord," proceeds to press upon the congregation their sacred duty in respect to this blessed One. It was not merely that there was a God, but He was their God. He had deigned to link Himself with them, in covenant-relationship. He had redeemed them, borne them on eagles' wings, and brought them unto Himself, in order that they might be to Him a people, and that He might be their God.
Blessed fact! Blessed relationship! But Israel had to be reminded of the conduct suited to such a relationship-conduct which could only flow from a loving heart. "Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy might." Here lies the secret of all true practical religion. Without this, all is valueless to God. "My son, give me thine heart." Where the heart is given, all will be right. The heart may be compared to the regulator of a watch, which acts on the hair-spring, and the hair-spring acts on the main-spring, and the main-spring acts on the hands, as they move around the dial. If your watch goes wrong, it will not do merely to alter the hands, you must touch the regulator. God looks for real heart-work, blessed be His name! His word to us is, "My little children, let us not love in word, neither in tongue; but in deed and in truth."
How we ought to bless Him for such touching words! they do so reveal His own loving heart to us. Assuredly, He loved us in deed and in truth, and He cannot be satisfied with any thing else, whether in our ways with Him or our ways one with another: all must flow straight from the heart.
"And these words which I command thee this day, shall be in thine heart"—at the very source of all the issues of life. This is peculiarly precious. Whatever is in the heart comes out through the lips and in the life. How important, then, to have the heart full of the Word of God—so full, that we shall have no room for the vanities and follies of this present evil world. Thus shall our conversation be always with grace, seasoned with salt. "Out of the abundance of the heart the mouth speaketh." Hence we can judge of what is in the heart by what cometh out of the mouth. The tongue is the organ of the heart—the organ of the man. "A good man out of the good treasure of the heart bringeth forth good things; and an evil man out of the evil treasure bringeth forth evil things." When the heart is really governed by the Word of God, the whole character reveals the blessed result. It must be so, inasmuch as the heart is the main-spring of our entire moral condition; it lies at the centre of all those moral influences which govern our personal history and shape our practical career.
In every part of the divine volume, we see how much importance God attaches to the attitude and state of the heart, with respect to Him or to His Word, which is one and the same thing. When the heart is true to Him, all is sure to come right; but on the other hand, we shall find that where the heart grows cold and careless as to God and His truth, there will, sooner or later, be open departure from the path of truth and righteousness. There is, therefore, much force and value in the exhortation addressed by Barnabas to the converts at Antioch—"He exhorted them all, that with purpose of heart they would cleave unto the Lord."
How needful then, now, always! This "purpose of heart" is most precious to God. It is what we may venture to call the grand moral regulator. It imparts a lovely earnestness to the Christian character which is greatly to be coveted by all of us. It is a divine antidote against coldness, deadness, and formality, all of which are so hateful to God. The outward life may be very correct, and the creed may be very orthodox; but if the earnest purpose of heart be lacking—the affectionate cleaving of the whole moral being to God and His Christ, all is utterly worthless.
It is through the heart that the Holy Ghost instructs us. Hence, the apostle prayed for the saints at Ephesus, that "the eyes of their heart [καρδίας not διανοίας] might be enlightened;" and again, "That Christ may dwell in your heart by faith."
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.