Mark 12:29

Literally the Lord our God is the only Lord: and this is the sense of the text in Deuteronomy vi. 4. The word in the original text, rendered by the term Lord, is the grand name JEHOVA, which signifies properly God, considered as the supreme Being, or the author of all existence.

1. That the great commandment of all, which is indeed inclusive of all, is, that of loving God with all our hearts. (1.) Where there is a commanding principle in the soul, there is a disposition to every other duty. Love is the leading affection of the soul; the love of God is the leading grace in the renewed soul. (2.) Where this is not, nothing else that is good is done, or done aright, or accepted, or done long. Loving God with all our heart, will effectually take us off from, and arm us against, all those things that are rivals with him for the throne in our souls, and will engage us to every thing by which he may be honoured, and with which he will be pleased; and no commandment will be grievous where this principle commands, and has the ascendant. Now here in, Mark, our Saviour prefixes to this command the great doctrinal truth upon which it is built (v. 29); Hear, O Israel, The Lord our God is one Lord; if we firmly believe this, it will follow, that we shall love him with all our heart. He is Jehovah, who has all amiable perfections in himself; he is our God, to whom we stand related and obliged; and therefore we ought to love him, to set our affections on him, let out own desire toward him, and take a delight in him; and he is one Lord, therefore he must be loved with our whole heart; he has the sole right to us, and therefore ought to have the sole possession of us. If he be one, our hearts must be one with him, and since there is no God besides, no rival must be admitted with him upon the throne.

Verses 28-34 Those who sincerely desire to be taught their duty, Christ will guide in judgment, and teach his way. He tells the scribe that the great commandment, which indeed includes all, is, that of loving God with all our hearts. Wherever this is the ruling principle in the soul, there is a disposition to every other duty. Loving God with all our heart, will engage us to every thing by which he will be pleased. The sacrifices only represented the atonements for men's transgressions of the moral law; they were of no power except as they expressed repentance and faith in the promised Saviour, and as they led to moral obedience. And because we have not thus loved God and man, but the very reverse, therefore we are condemned sinners; we need repentance, and we need mercy. Christ approved what the scribe said, and encouraged him. He stood fair for further advance; for this knowledge of the law leads to conviction of sin, to repentance, to discovery of our need of mercy, and understanding the way of justification by Christ.