But just as Nephi’s vision in 1 Nephi 14, and just as Isaiah’s prophecies in 2 Nephi 23 and 24 all end in the victory of God, Nephi concludes his exposition of Isaiah’s revelations on a set of very promising notes. After writing with assurance that the Lord will preserve the testimonies of "two nations … that I am God" (29:8), and that he will also "speak unto all nations of the earth and they shall write it" (29:12), Nephi prophesied that after many years, the seed of Lehi’s posterity will receive the gospel again (30:5). Nephi used a metaphor to describe the moral state of people before they receive the gospel—they have scales of darkness, like fish scales, over their eyes (30:6).
Take a careful look at verse 6. Nephi specified two things that must precede the falling of the scales of darkness from one’s eyes. First, the person must "rejoice" (receive the gospel with gladness) and second, the person must "know [that the knowledge of the gospel] is a blessing unto them from the hand of God."