12:28-34 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.

29. And Jesus answered him, The first of all the commandments is—The readings here vary considerably. Tischendorf and Tregelles read simply, "the first is"; and they are followed by Meyer and Alford. But though the authority for the precise form of the received text is slender, a form almost identical with it seems to have most weight of authority. Our Lord here gives His explicit sanction to the distinction between commandments of a more fundamental and primary character, and commandments of a more dependent and subordinate nature; a distinction of which it is confidently asserted by a certain class of critics that the Jews knew nothing, that our Lord and His apostles nowhere lay down, and which has been invented by Christian divines. (Compare Mt 23:23).

Hear, O Israel; the Lord our God is one Lord—This every devout Jew recited twice every day, and the Jews do it to this day; thus keeping up the great ancient national protest against the polytheisms and pantheisms of the heathen world: it is the great utterance of the national faith in One Living and Personal God—"One Jehovah!"