What about you? Can YOU tell us infallibly?
What about you? Can YOU tell us infallibly?
Of course not. Christ's Church alone can.
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Let me try to speed this up a bit, rather than repeating the same points endlessly.
The next logical question is, How do we know that the Catholic Church is infallible?
The Bible tells us so. The Bible calls the Catholic Church, "the pillar and foundation of truth."
But, up to this point, I have created a circular argument.
There is a way out. I can begin my argument by simply considering the Bible as a historical document.
Even non-Christians can agree that the Bible is the best attested-to historical document of its era. If we begin by treating the New Testament as a historical document, we notice that Christ claimed divinity, claimed to establish a Church, and that He made several predictions, including the prediction that the "gates of hell" would not prevail against His Church.
Simply by examining history, we see in the Catholic Church an unparalleled earthly institution, in terms of organization and continuity of leadership. Moreover, the Church possesses an unparalleled, non-contradictory body of teaching, in keeping with It being "the pillar and foundation of truth."
Additionally, countless public miracles are associated with this same Church, including extant, persistent, public miracles, that can be subjected to scientific examination (Tilma of Juan Diego, Shroud of Turin, Eucharistic Mircacle of Lanciano).
These facts, and this simple argument, demonstrate, with extreme probability, that the Catholic Church is of divine origin.
This confirms Christ's prophecy, and thus, His divinity as well, again with extreme probability.
Since we now know, again, with high probability, that Christ is Who He claimed to be, and that the Catholic Church is His Church, we can be sure that the Catholic Church has the authority to determine the canon of Scripture.
And your alternative authority is... who? King James? Martin Luther?