In our view the main factor underlying the relative success and vitality inthe Karajá society lies in the Karajá’s attitudes toward their language and culture,based on their deep beliefs in their cosmology – the Aruanã rites
This sentence serves as the thesis statement for the commentary, which defines the cause of the Karaja language's preservation. This is interesting because the reason for the preservation is not politics or economics, but to a "strong inner spiritual motivation" and deep cultural beliefs (the Aruana rites).
I can use this in an angle for synthesis by comparing the Karaja people's spiritual fight for language vitality with the personal and political fights for linguistic freedom detailed by other writers like Lyiscott and Baldwin.