God saved his people so that they could freely live the greatest mission possible: to love God and love neighbor. Loving God is hard, as we can fully comprehend, but so is loving our neighbor.
Herman Bavinck reflects on it this way:
[If] the life of service for humanity, of love for the neighbor, is not rooted in the law of God it loses its force and character. After all, the love for one's neighbor is not a self-vindicating thing which comes up quite spontaneously and naturally our of the human heart. It is a feeling, rather, and an action, and a service, which require tremendous will-power and which must be constantly maintained against the formidable forces of self-concern and of self-interest. Moreover, such love of the neighbor frequently gets little support from the neighbor himself. People generally are not so lovable that we should naturally, without exertion and struggle, cherish and love them as we do ourselves" (Our Reasonable Faith, 1956, pg. 22).
Loving neighbor properly requires and demands just as much work of grace and the Holy Spirit as does properly loving the Truine God. Loving the neighbor is very, very hard when done properly because we love the other with no expectation of reciprocity. This is highly challenging in a culture that values relationships in a utilitarian sense-- "if you scratch my back, I'll scratch yours." Loving neighbor properly, on the contrary, means that we offer to scratch the back of the other with no expectation or condition that the favor be returned.
The ways in which we violate and sabotage our love of neighbor includes, for example, the false things we say about others, how we steal from others, or covet the possessions (including character gifts) of others.
The Larger Catechism of the Westminster Confession of Faith explains what our salvation is for in terms of neighbor love with the questions. If you read this carefully you'll see that loving your neighbor requires much grace:
Q. 140. Which is the eighth commandment?
A. The eighth commandment is, Thou shalt not steal.
Q. 141. What are the duties required in the eighth commandment?
A. The duties required in the eighth commandment are, truth, faithfulness, and justice in contracts and commerce between man and man; rendering to every one his due; restitution of goods unlawfully detained from the right owners thereof; giving and lending freely, according to our abilities, and the necessities of others; moderation of our judgments, wills, and affections concerning worldly goods; a provident care and study to get, keep, use, and dispose these things which are necessary and convenient for the sustentation of our nature, and suitable to our condition; a lawful calling, and diligence in it; frugality; avoiding unnecessary lawsuits, and suretiship, or other like engagements; and an endeavor, by all just and lawful means, to procure, preserve, and further the wealth and outward estate of others, as well as our own.
Q. 142. What are the sins forbidden in the eighth commandment?
A. The sins forbidden in the eighth commandment, besides the neglect of the duties required, are, theft, robbery, man-stealing, and receiving anything that is stolen; fraudulent dealing, false weights and measures, removing landmarks, injustice and unfaithfulness in contracts between man and man, or in matters of trust; oppression, extortion, usury, bribery, vexatious lawsuits, unjust enclosures and depredation; engrossing commodities to enhance the price; unlawful callings, and all other unjust or sinful ways of taking or withholding from our neighbor what belongs to him, or of enriching ourselves; covetousness; inordinate prizing and affecting worldly goods; distrustful and distracting cares and studies in getting, keeping, and using them; envying at the prosperity of others; as likewise idleness, prodigality, wasteful gaming; and all other ways whereby we do unduly prejudice our own outward estate, and defrauding ourselves of the due use and comfort of that estate which God hath given us.
Q. 143. Which is the ninth commandment?
A. The ninth commandment is, Thou shalt not bear false witness against thy neighbour.
Q. 144. What are the duties required in the ninth commandment?
A. The duties required in the ninth commandment are, the preserving and promoting of truth between man and man, and the good name of our neighbor, as well as our own; appearing and standing for the truth; and from the heart, sincerely, freely, clearly, and fully, speaking the truth, and only the truth, in matters of judgment and justice, and in all other things whatsoever; a charitable esteem of our neighbors; loving, desiring, and rejoicing in their good name; sorrowing for and covering of their infirmities; freely acknowledging of their gifts and graces, defending their innocency; a ready receiving of a good report, and unwillingness to admit of an evil report, concerning them; discouraging talebearers, flatterers, and slanderers; love and care of our own good name, and defending it when need requireth; keeping of lawful promises; studying and practicing of whatsoever things are true, honest, lovely, and of good report.
Q. 145. What are the sins forbidden in the ninth commandment?
A. The sins forbidden in the ninth commandment are, all prejudicing the truth, and the good name of our neighbors, as well as our own, especially in public judicature; giving false evidence, suborning false witnesses, wittingly appearing and pleading for an evil cause, outfacing and overbearing the truth; passing unjust sentence, calling evil good, and good evil; rewarding the wicked according to the work of the righteous, and the righteous according to the work of the wicked; forgery, concealing the truth, undue silence in a just cause, and holding our peace when iniquity calleth for either a reproof from ourselves, or complaint to others; speaking the truth unseasonably, or maliciously to a wrong end, or perverting it to a wrong meaning, or in doubtful or equivocal expressions, to the prejudice of the truth or justice; speaking untruth, lying, slandering, backbiting, detracting, talebearing, whispering, scoffing, reviling, rash, harsh, and partial censuring; misconstructing intentions, words, and actions; flattering, vainglorious boasting, thinking or speaking too highly or too meanly of ourselves or others; denying the gifts and graces of God; aggravating smaller faults; hiding, excusing, or extenuating of sins, when called to a free confession; unnecessary discovering of infirmities; raising false rumors, receiving and countenancing evil reports, and stopping our ears against just defense; evil suspicion; envying or grieving at the deserved credit of any; endeavoring or desiring to impair it, rejoicing in their disgrace and infamy; scornful contempt, fond admiration; breach of lawful promises; neglecting such things as are of good report, and practicing, or not avoiding ourselves, or not hindering what we can in others, such things as procure an ill name.
Q. 146. Which is the tenth commandment?
A. The tenth commandment is, Thou shalt not covet thy neighbour's house, thou shalt not covet thy neighbor's wife, nor his manservant, nor his maidservant, nor his ox, nor his ass, nor anything that is thy neighbour's.
Q. 147. What are the duties required in the tenth commandment?
A. The duties required in the tenth commandment are, such a full contentment with our own condition, and such a charitable frame of the whole soul toward our neighbor, as that all our inward motions and affections touching him, tend unto, and further all that good which is his.
Q. 148. What are the sins forbidden in the tenth commandment?
A. The sins forbidden in the tenth commandment are, discontentment with our own estate; envying and grieving at the good of our neighbor, together with all inordinate motions and affections to anything that is his.