The plan of salvation is the fulness of the gospel. It includes the Creation, the Fall, the Atonement of Jesus Christ, and all the laws, ordinances, and doctrines of the gospel. Moral agency, the ability to choose and act for ourselves, is also essential in Heavenly Father’s plan. Because of this plan, we can be perfected through the Atonement, receive a fulness of joy, and live forever in the presence of God. Our family relationships can last throughout the eternities.
Plan of Salvation
The Atonement of Jesus Christ assures each of us that we will be resurrected and live forever. But if we are to live forever with our families in Heavenly Father’s presence, we must do all that the Savior commands us to do. This includes being baptized and confirmed and receiving the ordinances of the temple.
Chapter 40: Temple Work and Family History
D&C 128:14-18 Why is Baptism for the Dead Such an Important Gospel Principle?
The Prophet Joseph Smith expounded three essential gospel principles:
1. The salvation of an individual's dead ancestors is "essential to our salvation," that is, one's life is inextricably intertwined with his ancestors' lives, for he cannot become perfect without them nor they without him (D&C 128:15)...
Doctrine and Covenants Student Manual, p. 317
The Book of Mormon does not teach the Mormon requirements for eternal life.
"One of the most distinctive doctrines of Mormonism is the belief in a plurality of Gods. This is generally understood to mean that there are innumerable Gods besides (and above) the God that we worship, all of whom are creators of worlds and objects of worship. Furthermore, these Gods were all once human, and just as they attained Godhood, so can we.”
Prof. Charles Harrell, “This is my Doctrine”: The Development of Mormon Theology, p. 114
3 Nephi 11:27
And after this manner shall ye baptize in my name; for behold, verily I say unto you, that the Father, and the Son, and the Holy Ghost are one; and I am in the Father, and the Father in me, and the Father and I are one.
3 Nephi 28:10
And for this cause ye shall have fulness of joy; and ye shall sit down in the kingdom of my Father; yea, your joy shall be full, even as the Father hath given me fulness of joy; and ye shall be even as I am, and I am even as the Father; and the Father and I are one;
The BoM does not tell you what you must do to become like like Jesus or the Father.
The Book of Mormon does tell us what we must do to become like Jesus and the Father:
(Book of Mormon | Alma 34:30 - 41)
30 And now, my brethren, I would that, after ye have received so many witnesses, seeing that the holy scriptures testify of these things, ye come forth and bring fruit unto repentance.
31 Yea, I would that ye would come forth and harden not your hearts any longer; for behold, now is the time and the day of your salvation; and therefore, if ye will repent and harden not your hearts, immediately shall the great plan of redemption be brought about unto you.
32 For behold, this life is the time for men to prepare to meet God; yea, behold the day of this life is the day for men to perform their labors.
33 And now, as I said unto you before, as ye have had so many witnesses, therefore, I beseech of you that ye do not procrastinate the day of your repentance until the end; for after this day of life, which is given us to prepare for eternity, behold, if we do not improve our time while in this life, then cometh the night of darkness wherein there can be no labor performed.
34 Ye cannot say, when ye are brought to that awful crisis, that I will repent, that I will return to my God. Nay, ye cannot say this; for that same spirit which doth possess your bodies at the time that ye go out of this life, that same spirit will have power to possess your body in that eternal world.
35 For behold, if ye have procrastinated the day of your repentance even until death, behold, ye have become subjected to the spirit of the devil, and he doth seal you his; therefore, the Spirit of the Lord hath withdrawn from you, and hath no place in you, and the devil hath all power over you; and this is the final state of the wicked.
36 And this I know, because the Lord hath said he dwelleth not in unholy temples, but in the hearts of the righteous doth he dwell; yea, and he has also said that the righteous shall sit down in his kingdom, to go no more out; but their garments should be made white through the blood of the Lamb.
37 And now, my beloved brethren, I desire that ye should remember these things, and that ye should work out your salvation with fear before God, and that ye should no more deny the coming of Christ;
38 That ye contend no more against the Holy Ghost, but that ye receive it, and take upon you the name of Christ; that ye humble yourselves even to the dust, and worship God, in whatsoever place ye may be in, in spirit and in truth; and that ye live in thanksgiving daily, for the many mercies and blessings which he doth bestow upon you.
39 Yea, and I also exhort you, my brethren, that ye be watchful unto prayer continually, that ye may not be led away by the temptations of the devil, that he may not overpower you, that ye may not become his subjects at the last day; for behold, he rewardeth you no good thing.
40 And now my beloved brethren, I would exhort you to have patience, and that ye bear with all manner of afflictions; that ye do not revile against those who do cast you out because of your exceeding poverty, lest ye become sinners like unto them;
41 But that ye have patience, and bear with those afflictions, with a firm hope that ye shall one day rest from all your afflictions.
(Book of Mormon | Alma 42:2 - 31)
2 Now behold, my son, I will explain this thing unto thee. For behold, after the Lord God sent our first parents forth from the garden of Eden, to till the ground, from whence they were taken—yea, he drew out the man, and he placed at the east end of the garden of Eden, cherubim, and a flaming sword which turned every way, to keep the tree of life—
3 Now, we see that the man had become as God, knowing good and evil; and lest he should put forth his hand, and take also of the tree of life, and eat and live forever, the Lord God placed cherubim and the flaming sword, that he should not partake of the fruit—
4 And thus we see, that there was a time granted unto man to repent, yea, a probationary time, a time to repent and serve God.
5 For behold, if Adam had put forth his hand immediately, and partaken of the tree of life, he would have lived forever, according to the word of God, having no space for repentance; yea, and also the word of God would have been void, and the great plan of salvation would have been frustrated.
6 But behold, it was appointed unto man to die—therefore, as they were cut off from the tree of life they should be cut off from the face of the earth—and man became lost forever, yea, they became fallen man.
7 And now, ye see by this that our first parents were cut off both temporally and spiritually from the presence of the Lord; and thus we see they became subjects to follow after their own will.
8 Now behold, it was not expedient that man should be reclaimed from this temporal death, for that would destroy the great plan of happiness.
9 Therefore, as the soul could never die, and the fall had brought upon all mankind a spiritual death as well as a temporal, that is, they were cut off from the presence of the Lord, it was expedient that mankind should be reclaimed from this spiritual death.
10 Therefore, as they had become carnal, sensual, and devilish, by nature, this probationary state became a state for them to prepare; it became a preparatory state.
11 And now remember, my son, if it were not for the plan of redemption, (laying it aside) as soon as they were dead their souls were miserable, being cut off from the presence of the Lord.
12 And now, there was no means to reclaim men from this fallen state, which man had brought upon himself because of his own disobedience;
13 Therefore, according to justice, the plan of redemption could not be brought about, only on conditions of repentance of men in this probationary state, yea, this preparatory state; for except it were for these conditions, mercy could not take effect except it should destroy the work of justice. Now the work of justice could not be destroyed; if so, God would cease to be God.
14 And thus we see that all mankind were fallen, and they were in the grasp of justice; yea, the justice of God, which consigned them forever to be cut off from his presence.
15 And now, the plan of mercy could not be brought about except an atonement should be made; therefore God himself atoneth for the sins of the world, to bring about the plan of mercy, to appease the demands of justice, that God might be a perfect, just God, and a merciful God also.
16 Now, repentance could not come unto men except there were a punishment, which also was eternal as the life of the soul should be, affixed opposite to the plan of happiness, which was as eternal also as the life of the soul.
17 Now, how could a man repent except he should sin? How could he sin if there was no law? How could there be a law save there was a punishment?
18 Now, there was a punishment affixed, and a just law given, which brought remorse of conscience unto man.
19 Now, if there was no law given—if a man murdered he should die—would he be afraid he would die if he should murder?
20 And also, if there was no law given against sin men would not be afraid to sin.
21 And if there was no law given, if men sinned what could justice do, or mercy either, for they would have no claim upon the creature?
22 But there is a law given, and a punishment affixed, and a repentance granted; which repentance, mercy claimeth; otherwise, justice claimeth the creature and executeth the law, and the law inflicteth the punishment; if not so, the works of justice would be destroyed, and God would cease to be God.
23 But God ceaseth not to be God, and mercy claimeth the penitent, and mercy cometh because of the atonement; and the atonement bringeth to pass the resurrection of the dead; and the resurrection of the dead bringeth back men into the presence of God; and thus they are restored into his presence, to be judged according to their works, according to the law and justice.
24 For behold, justice exerciseth all his demands, and also mercy claimeth all which is her own; and thus, none but the truly penitent are saved.
25 What, do ye suppose that mercy can rob justice? I say unto you, Nay; not one whit. If so, God would cease to be God.
26 And thus God bringeth about his great and eternal purposes, which were prepared from the foundation of the world. And thus cometh about the salvation and the redemption of men, and also their destruction and misery.
27 Therefore, O my son, whosoever will come may come and partake of the waters of life freely; and whosoever will not come the same is not compelled to come; but in the last day it shall be restored unto him according to his deeds.
28 If he has desired to do evil, and has not repented in his days, behold, evil shall be done unto him, according to the restoration of God.
29 And now, my son, I desire that ye should let these things trouble you no more, and only let your sins trouble you, with that trouble which shall bring you down unto repentance.
30 O my son, I desire that ye should deny the justice of God no more. Do not endeavor to excuse yourself in the least point because of your sins, by denying the justice of God; but do you let the justice of God, and his mercy, and his long-suffering have full sway in your heart; and let it bring you down to the dust in humility.
31 And now, O my son, ye are called of God to preach the word unto this people. And now, my son, go thy way, declare the word with truth and soberness, that thou mayest bring souls unto repentance, that the great plan of mercy may have claim upon them. And may God grant unto you even according to my words. Amen.