"The first four of the Ten Commandments are summed up in the one great precept, “Thou shalt love the Lord thy God with all thy heart.” The last six are included in the other, “Thou shalt love thy neighbor as thyself.” Both these commandments are an expression of the principle of love. The first cannot be kept and the second broken, nor can the second be kept while the first is broken. When God has His rightful place on the throne of the heart, the right place will be given to our neighbor. We shall love him as ourselves. And only as we love God supremely is it possible to love our neighbor impartially.
"And since all the commandments are summed up in love to God and man, it follows that not one precept can be broken without violating this principle. Thus Christ taught His hearers that the law of God is not so many separate precepts, some of which are of great importance, while others are of small importance and may with impunity be ignored. Our Lord presents the first four and the last six commandments as a divine whole, and teaches that love to God will be shown by obedience to all His commandments.
"The scribe who had questioned Jesus was well read in the law, and he was astonished at His words. He did not expect Him to manifest so deep and thorough a knowledge of the Scriptures. He had gained a broader view of the principles underlying the sacred precepts. Before the assembled priests and rulers he honestly acknowledged that Christ had given the right interpretation to the law, saying:
'Well, Master, Thou hast said the truth: for there is one God; and there is none other but He: and to love Him with all the heart, and with all the understanding, and with all the soul, and with all the strength, and to love his neighbor as himself, is more than all whole burnt offerings and sacrifices.' "
Taken from Desire of Ages, pp. 607-608.
For, brethren, ye have been called unto liberty; only use not liberty for an occasion to the flesh, but by love serve one another.
For all the law is fulfilled in one word, even in this;
Thou shalt love thy neighbour as thyself.