1 Nephi 13: 40-41

"40 And the angel spake unto me, saying: These last records, which thou hast seen among the Gentiles, shall establish the truth of the first, which are of the twelve apostles of the Lamb, and shall make known the plain and precious things which have been taken away from them; and shall make known to all kindreds, tongues, and people, that 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.

-- Latter-day scriptures help to fulfill three roles: 1) serve as additional witnesses that the Bible is true; 2) fill in the gospel holes which were created by the removal of plain and precious things from the Bible; and 3) declare unto all people of the world that Jesus Christ, the Lamb of God, truly is their Savior and only source of salvation.

"41 And they must come according to the words which shall be established by the mouth of the Lamb; and the words of the Lamb shall be made known in the records of thy seed, as well as in the records of the twelve apostles of the Lamb; wherefore they both shall be established in one; for there is one God and one Shepherd over all the earth."

-- Salvation is obtained not merely by coming unto Christ, but by coming unto Him according to the manner that He has prescribed. He is the Master Healer and has given a prescription to heal us from sin and pain and loneliness and fear and every other aspect of life that is not of God. We must follow the prescription to have hope of obtaining the promised salvation. Jesus declared, “Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.” (Matt 7:21). The details of this prescription are found in His words, which are found in the Book of Mormon and the Bible.

-- “…they both shall be established in one…”: the Book of Mormon and the Bible stand side by side as companion volumes of scripture. Their words are combined in establishing God’s truth in clarity for the whole earth. They set forth the reality of “One Lord, one faith, one baptism.” (Eph 4:5) Just as the Father, the Son, and the Holy Ghost are separate beings, unified in one single purpose, so too are The Book of Mormon and the Bible separate books, unified in one doctrine – the doctrine of Christ.

-- In this one verse, Jesus is referenced as both a lamb and a shepherd. He has walked in our shoes as a sheep. Thus, He knows perfectly well the trials that we face. Now, he tends to our needs as a loving shepherd who knows each one of His sheep by name.