Alma asserted in verse 8 that the records had already been effective in bringing people to the Savior. He bolsters that statement with the experience of Ammon and his brethren among the Lamanites, which resulted in the removal of a large number of Lamanite converts from the Lamanite lands to Jershon. In verse 10 Alma extrapolates from the success of Ammon that the future may yet hold promise of further conversions of their Nephite brethren. Note the contrast between the past use of the records to convert Lamanites, and the hope of future use to convert Lamanites. Alma understands that major changes are afoot. He is a here presaging of the civil war that is soon coming.