calvinism considers itself as operating within an authoritative christian tradition, but correcting it against what is demonstrably non-biblical, rather than making up something new later. the idea that the canon is in some measure part of tradition is not problematic. that being said, canon is objective. a book is canonical because it was inspired by god, not because anyone says that it's canonical. either god inspired a book or he didn't, and thus the objective reality of canon is something that is also prior to tradition. so the most the church can ever do is recognize that a text is inspired.
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