I’d have to see some reasoning why this would be an “obvious corollary,”
I should rather have said: it is an obvious corollary of the material sufficiency of Scripture, which all adherents of sola scriptura hold (though by most definitions they also hold some form of “formal sufficiency”). If Scripture is materially sufficient, then all revealed truth is found in Scripture. But obviously there was a time before that truth was all written down. I suppose it is logically possible that this truth was unknown to human beings before it was written down, but we know for a fact that this was not the case (that the NT in particular was written down as a record of things the apostles were already preaching). I should perhaps have said that it’s an obvious corollary of sola scriptura in the light of what we know beyond dispute about the writing of the NT books (whether that oral process lasted for a few years or for many decades is not the point–hence I can say that the basic concept is beyond dispute). In other words, since we know that there was once authoritative oral tradition (2 Thess. 2:15 as well as plenty of indirect evidence), the only way one can believe in sola scriptura is to believe that at some point all of this was written down. It’s astounding to me that you would find this novel or surprising. You seem to have assumed that all adherents of sola scriptura were complete idiots, which is generally a bad idea.
not to mention the Scriptural basis for that claim.
As Catholic apologists have pointed out, there is a clear Scriptural basis for the claim that the Word of God existed in oral as well as written form during the apostolic era. Some Protestants try to argue that 2 Tim. 3:16 supports Sola Scriptural, but the only way that will work in my opinion is if you can argue that the apostolic teaching mentioned in 2 Thess. 2:15 was all written down by that time (well, even then I think the argument is weak, but it’s not obviously false). Otherwise, we are left on both sides with probabilistic arguments and appeals to tradition to decide just where that apostolic tradition “went.” (Obviously you think you have authoritative Church teaching on your side, but in Protestant-Catholic controversy that’s begging the question, since the status of such authority is precisely what is in doubt.)
In fact, as I have already said, this claim radically undermines SS because the Epistles were written to audiences living during Apostolic times and thus they could not have understood any passage to be teaching SS (because it was not operational).
A Reformed Baptist friend of mine suggested that 2 Timothy may have been the last book of the NT written (that would obviously require dating Revelation much earlier than usual, since he certainly was not questioning Pauline authorship of 2 Timothy), and that would save 2 Tim. 3:16 as an argument for SS. One can make a more reasonable case that it may have been the last
epistle written (whether or not it was written by Paul, because if you take a conservative view of the Pastorals you’ll probably take a conservative view of other disputed letters like 2 Peter, and vice versa), which would arguably still constitute “enscripturation” of the teaching that the apostles had been orally proclaiming. I should leave the explication of this view to people who actually believe it. I’m simply pointing out that some doctrine of “enscripturation” is necessary if one is going to defend sola scriptura.
In my opinion sola scriptura is best argued not on the basis of Scripture but rather by shifting the burden of proof: we know at least some places where the Word of God is (in those books that Christians have always confessed to be divinely inspired), and if it is somewhere else as well there had better be similarly strong evidence for it. Since there isn’t (the argument would run), we dare not put our full confidence in any other putative source for the Word of God. I don’t find this argument fully convincing either, but I think it’s much better than the attempt to argue for a dogma of Sola Scriptura on the basis of Scripture.
The basic point you need to understand is that the force of Sola Scriptura rests on the many passages in Scripture where the Word of God is contrasted with human teaching or human tradition. This naturally leads Protestants to think that God is warning them not to trust in human tradition as if it were God’s Word, and that leads them to be willing to err on the side of caution when examining any putative “Word of God.”
So why are you a Protestant if you think the Catholic case is stronger?
I would have thought that you know me (or rather my Internet persona) well enough by now to know that I am not a Protestant in the sense of being bound to defend some “Protestant” theological position, as distinct from the specific theological commitments involved in being Anglican. For me “Protestant” is primarily a historical label–that is certainly the only sense in which I’m comfortable applying it to myself. I remain a Protestant in this sense because this is the form in which the Gospel came to me, and it is rash and arrogant to run around looking for “purer” or more congenial forms of religion. I probably should not have become Episcopalian, but I am one now, and I’m staying put until God clearly calls me to do otherwise.
Edwin