Ether 8-10,
President Russell M. Nelson:
The Savior referred to the Book of Mormon as His “new covenant” with the house of Israel. It is a tangible sign of Christ’s culminating covenant with mankind. The divine teachings of this book, as a third testament, clarify doctrine and unify the Old Testament with the New Testament. Scriptural covenants, testaments, and witnesses since the beginning of time relate to the Atonement of Jesus Christ, the central act of all human history.
The Book of Mormon is the most important religious text to be revealed from God to man “since the writings of the New Testament were compiled nearly two millennia ago.” Joseph Smith declared the Book of Mormon to be “the most correct of any book on earth, and the keystone of our religion.” It is the only book that the Lord Himself has testified to be true.
The crowning event of this sacred record is the personal ministry of the resurrected Lord to people of ancient America. To them He made this revelatory announcement:
“Behold, I am Jesus Christ the Son of God. I created the heavens and the earth, and all things that in them are. I was with the Father from the beginning. …
“… The scriptures concerning my coming are fulfilled. …
“I am the light and the life of the world. …
“… Whoso cometh unto me with a broken heart and a contrite spirit, him will I baptize with fire and with the Holy Ghost. …
“… I have come unto the world to bring redemption unto the world, to save the world from sin.
“Therefore, whoso repenteth and cometh unto me as a little child, him will I receive, for of such is the kingdom of God. … I have laid down my life, and have taken it up again; therefore repent, and come unto me, … and be saved.”
After that supernal introduction, the Master reinforced His identity by allowing the multitudes to thrust their hands into His side and feel the prints of the nails in His hands and in His feet. Then they knew that the very God of Israel stood in their presence—He who had been slain for the sins of the world.
He instructed the people. He taught them to pray, to repent, to be baptized, to partake of the sacrament, to know of His doctrine, to understand the importance of sacred ordinances and covenants, and to endure to the end. (“A Testimony of the Book of Mormon,” Ensign, Nov. 1999.)