Mormon 7:5

Know ye that ye must come to the knowledge of your fathers, and repent of all your sins and iniquities, and believe in Jesus Christ, that he is the Son of God, and that he was slain by the Jews, and by the power of the Father he hath risen again, whereby he hath gained the victory over the grave; and also in him is the sting of death swallowed up.

As Mormon writes his final words to the posterity of a destroyed civilization, the shares a powerful lesson with a promise. He tells his readers to "come to a knowledge of [their] fathers," thus echoing the commandment to "remember", which appears often in the Book of Mormon. Remembering means not only knowing who our fathers were, but also knowing what they knew. In other words, it is to regain the knowledge the fathers had about God, Christ, and the Plan of Salvation, which was lost through apostasy. It is to discover again what we should have known all along. Once the knowledge is restored, we can recognize our sins and repent, believe in Christ, and accept him as our Savior. That is Mormon's whole purpose and his labor of love.

Alma 41:2

I say unto thee, my son, that the plan of restoration is requisite with the justice of God; for it is requisite that all things should be restored to their proper order. Behold, it is requisite and just, according to the power and resurrection of Christ, that the soul of man should be restored to its body, and that every part of the body should be restored to itself.

Alma uses the word "requisite" three times while speaking of justice and restoration. "Requisite" means simply "required." God's sense of justice requires that all things be restored to their proper place. Our bodies, which have been ravaged by the rigors of mortality, have to be restored to full health, and all the parts must work. Our spirits likewise must be returned to the condition they should be in based on our intentions and desires, regardless of how ravaged they may be by mortal temptation and sin. Our physical and spiritual restoration are made possible by the atonement of Christ so that the Father's justice can be perfect. Without the atonement, God could not fix us and still be just and fair. Through the atonement, however, he can fix everything and make all things as they should be. His sense of justice demands restoration, and the atonement enables it.

Second Nephi 25:11

And now this I speak because of the spirit which is in me. And notwithstanding they have been carried away they shall return again, and possess the land of Jerusalem; wherefore, they shall be restored again to the land of their inheritance.

An example of both a literal prophecy and a spiritual reality: Nephi learned from Isasiah that because of iniquity, the Jews will be held captive by the wicked world, but eventually when they are humbled, they will return to their land. This is an allegory for what happens to us when we sin. We find ourselves cut off from the Spirit, and perhaps even cut off from the church for a while. But when we repent, Christ restores our blessings and will welcome us into his kingdom, which is our eternal promised land.