3 Nephi 14-16,
The Lord Himself said the Book of Mormon contains “the fulness of my everlasting gospel” (D&C 27:5; see also D&C 42:12). The Book of Mormon unveils the plan of salvation and “answers the great questions of the soul.”
The lessons of truth in the Book of Mormon are taught in the difficult circumstances of war and oppression, in the sermons of prophets, in the conversations of fathers to sons, and in the Savior’s own words. There is a central theme: “God himself shall come down among the children of men, and shall redeem his people” (Mosiah 15:1). There are those who are seeking: “And I will tell you of the wrestle which I had before God” (Enos 1:2). There is the constant call to leave our sins behind and step to a higher level: “And it came to pass that I was three days and three nights in the most bitter pain and anguish of soul; and never, until I did cry out unto the Lord Jesus Christ for mercy, did I receive a remission of my sins. But behold, I did cry unto him and I did find peace to my soul” (Alma 38:8; emphasis added). And there are the comforting and peace-filled words of the Savior: “Will ye not now return unto me … that I may heal you? … If ye will come unto me ye shall have eternal life. Behold, mine arm of mercy is extended towards you, and whosoever will come, him will I receive” (3 Nephi 9:13–14).
The Book of Mormon gently passes its stories and testimonies before us. As we ponder them and pray about them, the Lord reveals to the quiet chambers of our hearts our own need to repent and change. As we covenant with the Lord and make changes in our lives, we feel the power of His Atonement and confirming peace. As our spiritual journey progresses, we feel strengthened by His grace as we confront the difficulties and disappointments of life. An Apostle has said, “When we want to speak to God, we pray. And when we want Him to speak to us, we search the scriptures.”
This is the peace of the true doctrine of Christ found in the Book of Mormon. (“The Book of Mormon: The Great Purveyor of the Savior’s Peace,” Ensign, Jan. 2008)