Nephi speaks in plainness of the central truth of the gospel—that Jesus Christ is the only name given under heaven whereby mankind can be saved. He blends his testimony with that of Isaiah (“Yea, and my soul delighteth in the words of Isaiah …”—2 Nephi 25:5). The Lord promises Nephi that his testimony of these things will be preserved and come forth at a future time unto the seed of Joseph, that the covenant blessings might be preserved. The avenue for the coming forth of this witness of Jesus Christ is the Book of Mormon.