3 Nephi 15:16-24 and 1 Nephi 13:40-41
When Jesus appeared to the Nephites and Lamanites in the Americas, He established His identity, His importance to their lives, and His law, the law of Christ. One of the most critical truths for us to understand is that there is “one fold and one shepherd” (3 Nephi 15:21). Jesus personally declared His divinity, His role as Savior and Redeemer, and the primacy of His law. His words in 3 Nephi echo earlier prophetic writings in 1 Nephi that “there is one God and one Shepherd over all the earth” (1 Nephi 13:41). This is Jesus Christ.
The Book of Mormon serves as a second witness of Jesus Christ. It stands alongside the Bible as a testimony of His divinity, it clarifies important points of doctrine such as the need for baptism by immersion by the proper authority, and teaches additional doctrines such as the Plan of Salvation in beautiful simplicity.
The role of Jesus Christ in our lives can be summed up in simple statements of truth. Just as there is one shepherd and one God over all the earth, so is there one plan and one law that apply to everyone on earth: “the Lamb of God is the Son of the Eternal Father, and the Savior of the world; and that all men must come unto him, or they cannot be saved” (1 Nephi 13:40). Our purpose on earth is to learn charity, selflessness, to become more like God, to repent when we fall short, to make promises to God, to keep His commandments, and to prepare for eternal life. Jesus Christ set the example and makes all this possible through His Atonement and Resurrection. By following Jesus Christ according to the pattern He set anciently and reestablished through His church today, we choose the path to eternal life.