I’m engaging in a Sola Scriptura debate with Protestants, (which is currently winding down.) and in it, we are debating whether or not, the Bible can stand on it’s own as the only infallible authority?
Infallibility has to proceed from
somewhere. It doesn’t just drop out of the sky.
If a Sola Scriptura adherent could show that the Bible makes that claim for itself, by itself, then they’d have a leg to stand on. Problem is… they can’t. Oh, sure, they can show that Scripture is inspired and “useful for teaching”… but the whole purpose for that usefulness is to be prepared to perform “every good work.”
The point is that the infallibility of the Bible – as compiled – has to proceed from some grounds. Catholics would claim that the Church compiled Scripture, and its authority to do so proceeds from Christ’s grant of proxy to Peter in Mt 16. Therefore, authority to teach without error proceeds from Christ, to the Church, and she compiles the Bible on this authority and promise of infallibility.
(By the way, we would say that, in certain circumstances, a person or persons may speak
infallibly, but that the Bible is
inerrant (i.e., ‘without error’).)
One of the Protestants has just pointed out that the Catholic Church has only infallibly interpreted a few passages in Sacred Scripture, how should I respond to this? What should my explanation be?
Your answer is “yes, that’s true.”
Your explanation could be “why does that surprise you? Do
you have infallible explanations for every verse? Do you
need infallible explanations for every verse? If so, then it’s not the Bible that you claim is infallible… it’s its Cliff Notes that are infallible? Do you, as an adherent to ‘Sola Scriptura’
really want to make that claim?”
(They’ll claim that the Bible doesn’t
need infallible interpretation, of course. At which point, you can pull out one of any number of verses of Scripture that various groups disagree on, and ask what its infallible interpretation is. The discussion will devolve into an assertion that
their interpretation is correct, and all others’ is wrong.

)