This is the point of the discussion of the miracles of the previous prophets. They spoke and performed miracles. Things happened because they willed them to happen through faith. In that same faith, they have prayed for the coming forth of the record, and therefore “no one need say they shall not come.” Just as these prophets have been effective through faith in the miracles performed during their lifetimes, they will also be effective in making certain that the Book of Mormon will be presented to the world.