Now if you ask 20 different people what sola scripture means, they might all give you different answers. So I tread lightly. For better or worse, I understand it in relation to the Catholic Church. It (circularly) says the Bible is the only authority and it’s doing so explicitly to reject the authority of the church on certain issues. The Church puts magisterial teaching on an equal footing with scripture.
The Church itself canonized the Bible, hopefully under the influence of the Holy Spirit. But the Bible itself, our apparent ultimately authority on everything, doesn’t explicitly teach “sola scripture which, as it turns out, is just another tradition or interpretation of the Bible among many. Kind of odd how that works? Claiming to believe something as an ultimate standard that the individual books of the Bible don’t similarly claim to be/do. That claim or authority is hardly based-on the Bible and the very concept of “the Bible” presumes canonization because what “the Bible” actually is, is a collection of 72 discrete publications written possibly over a thousand years, lumped together by the Church.
Time and time again scripture shows itself to possess ancient cosmology and outdated worldviews (misogyny, slavery etc). It cannot be the sole authority on everything unless we espouse wooden literalism.
Prima scriptura is much better than sola scripture but since the Bible did not fall from heaven as a completed work, but was put together as individual publications from vastly different regions and times disseminated and became popular, one cannot remove tradition from the equation. Tradition/Church and the Bible are inseparably intertwined.
The NT and Jesus also seem to appeal to non-biblical source quite a few times.
That last part sounds to me like an appeal to extra-biblical tradition, something I’m not sure is consistent with “sola scripture.”
I’m pretty convinced that in the end, sola scripture saws off the branch it is sitting on. Not to mention if we used the Bible as our final authority on everything, a 6,000 year old earth, a global flood, a dome in the sky and so on would all still be believed in today. We have allowed science (and in many cases reason and common sense) to change how we understand the plain sense of scripture’s words. I mean, Luke traces Jesus’s genealogy back to Adam. In my experience, proponents of sola scripture aren’t the type to claim the Bible makes accommodated cosmological errors though they can and do fully admit Scripture can use the “language of appearance.” And I think a lot of Christians today just accept sola scripture as part of their tradition without thinking too much about what it means.