"For behold, I say unto you that as many of the Gentiles as will repent are the covenant people of the Lord; and as many of the Jews as will not repent shall be cast off; for the Lord covenanteth with none save it be with them that repent and believe in his Son, who is the Holy One of Israel."
To the extent that gentiles "will repent" they may become part of the Lord's "covenant people." They are not the remnant, but they may join in the covenant. If they do, then by virtue of the covenant they become "covenant people."
What is required for the gentiles to repent?
What covenant must they enter into or receive so they may be numbered among the "covenant people?" Is membership in The Church of Jesus Christ of Latter-day Saints the only thing needed to "repent" and become a "covenant people?" If not, then what else would be required?
To the extent that "the Jews will not repent" then they will be "cast off." Although history has shown how the Jews have been treated (as Nephi put it), "ye have cursed them, and have hated them, and have not sought to recover them." (2 Ne. 29: 5.) These difficulties suffered by the Jews are preliminary. The Lord always watched over and preserved them from complete destruction. However, when the Gospel is offered to them in the last days, in the final offering to the last (who had once been first--see 1 Ne.13: 42), they will reject the offered renewal of the covenant at their peril. If they reject it, they "shall be cast off" because that will sever the covenant. "The Lord covenanteth with none save it be with them that repent and believe in his Son, who is the Holy One of Israel."
Although we know the Lord will extend every opportunity to the descendants for the sake of a covenant with those who have become the friends of God, there are limits. God will do all He has promised to do. He will forbear, entreat, beseech, send messengers, labor alongside with His messengers, and do all He can to reclaim the heirs for the covenant's sake. In the end, however, the heirs must either accept what He offers, or be cast off.
It is extraordinary how long the Lord will extend His hand to reclaim His people. But everyone must choose to follow Him. We have our agency. We cannot be forced to follow Him. Even though He may be longsuffering and patient, He cannot compel any to be saved. (Moses 4: 1-3.) Unless a person is free to choose for themselves, there is no existence. (D&C 93: 30.)
Well, all of this is of no import if the gentiles do not "repent." Whenever we brush up against that subject we wind up engaged in discussions about justice, mercy, vengeance and restitution. I've written about this process in both The Second Comforter and Come, Let Us Adore Him. Briefly, here are some of the most important points: To be forgiven we must forgive. Not just forgive, but plead for mercy for those who have offended us. The role of accusing is left to "the accuser of the brethren" or Satan. (Rev. 12: 10.) When we accuse others we interfere with their salvation. If we are the one who was offended, and we make no accusation against them, then we become their savior. Satan's right to accuse is inferior to ours as victims of the offense. We suffer in the flesh the wrongs of others. If we make no claim for justice, surrender those and seek instead for mercy on behalf of others, then Satan's accusations can have no claim upon them. We mimic Christ, follow His example, and in our own limited way also atone for the sins of others. Joseph Smith was trying to get us to understand this concept when he taught: "If you do not accuse each other, God will not accuse you. If you have no accuser you will enter heaven, and if you will follow the revelations and instructions which God gives you through me, I will take you into heaven as my back load. If you will not accuse me, I will not accuse you. If you will throw a cloak of charity over my sins, I will over yours—for charity covereth a multitude of sins." (DHC. 4:445)
I have explained this at length in what I've written in Come, Let Us Adore Him. Christ said this in His ministry repeatedly. He lived it. He showed by His own example the way to obtain forgiveness for every wrong you have ever done. It is in the same way He went about atoning for sins. It is by suffering offenses and returning good. It is by forgiving those who despitefully use and abuse you. It is through loving those who are your enemies. It is by becoming sons and daughters of God. And it can be done in no other way. (Matt. 5: 38-48.) If you do not forgive others, you cannot be forgiven. (Matt. 6: 14-15.) This is why Christ, in teaching us to pray, told us we are only forgiven as we forgive others. (Matt. 6: 12.) It is as we forgive that we obtain forgiveness.
The way is strait and narrow, and cannot permit you to pass through while carrying any burden of accusation, desire for revenge or even just complaint about others. When you lay down what you might justly claim against others and seek nothing for their offenses, then you are able to enter in. To be blessed, we must seek peace with those who would make war against us. (Matt. 5: 9.) When we judge all others with mercy, it is with mercy alone we will be judged. (Matt. 7: 2.)
For the most part, the gentiles will not repent. They will hold courts, use their time judging, exact conditions, set limits, and annotate their permanent records with notes showing what discipline a person has undergone. And happily employ control, compulsion and dominion over one another (D&C 121: 37) right up to the time when the trumpet sounds and it is everlastingly too late. Others will justify this failure to forgive, shout praises to the abuse, and claim all compulsion and dominion is necessary to protect us from the evil. Even though our Master told us not to resist the evil, but forgive it. (Matt. 5: 39.)
For the most part, the gentiles will demand they be judged by a law they cannot satisfy. Some few, however, will forgive and plead for the weaknesses and failings of others. They will forgive, and thereby be forgiven. They will obtain for themselves a judgment based only on mercy, for they have shown mercy to others. This atoning act of love and intercession will be the hallmark by which the children of God are identified in the Day of Judgment. (Matt. 5: 9.) Only the peacemakers can be trusted to live in peace with one another. All others are unfit for the presence of God.