Alma repeats the basic information we have in verses 8-10. The parallels in the information are such that we must assume that Alma had this basic structure in mind as the way to present his information to Helaman. The first time he begins the argument in 8-10 he gets sidetracked into his vision of the future, a point he had perhaps not originally intended to include in his discourse to Helaman. As part of getting back “on track,” Alma returns to his original plan of how to present this charge to Helaman, and he repeats the basic argument. The plates are preserved for a wise purpose, they have already convinced Lamanites; they may convince people (his own Nephites?) in the future.