Protestant to a Catholic: How do you establish that the Catholic Church has authority over scripture?
Catholic: Simple. For starters, it’s in scripture. “On this rock” and so much more.
Protestant: For starters?
Catholic: We also rely on tradition.
Protestant: How much is “also.”
Catholic” Half and half. Half on scripture, and half on tradition.
Protestant: What would happen if you were to rely on tradition alone for your authority? Would that halve the authority of the barque of Peter?
Catholic: No, the authority would be the same; the only difference is that the barque would sail at half-mast.
The Talmudic Jew, in contrast to the Catholic, does not fall for or into this circular kind of reasoning. For him, tradition (Oral Torah) produced scripture (Written Torah). Where is his authority for this? Why, tradition. At full sail.