The narrator praises the author for the powerful use of historical stories in the book, highlighting the Muhammad Ali story as a warning against the consequences of not quitting when necessary. The concept of grit versus quit is emphasized, with the notion that true success lies in knowing what to persist with and what to let go of. Society often glorifies grit as a virtue, but the key is to apply grit wisely by sticking to the right things and quitting those that are no longer worthwhile.