What is the origin of the Sola Scriptura doctrine of the Protestants?
Who firstly and most famously argued this doctrine, and what was the main rationale for it?
That’s a hard question to answer. Much harder than sola fide, which was Luther’s invention.
For one thing, the phrase “sola scriptura” was not used by the Reformers, but was a later coinage. However, the doctrine was certainly taught by the Reformers. According to Luther, at least, it was also taught by late medieval scholastics–at least, Luther claimed that his doctrine of Scripture was simply what he had learned at Erfurt from Jodocus Trutvetter.
Part of the problem is that sola scriptura can be defined in several ways. If it’s defined as the “material sufficiency of Scripture” (that all binding doctrine may be found in Scripture) which is the most minimal definition, then it goes back at least to the fourth century. But that’s an inadequate definition, since Catholics may accept material sufficiency.
“Formal sufficiency” is a more common way to define sola scriptura: that the believer, through a due use of the ordinary means, may arrive at certainty regarding all necessary doctrine. However, this is still ambiguous. What role does tradition play among the “ordinary means?” What percentage of believers, with precisely what kinds and degrees of “ordinary means” and what sorts of interior dispositions, need to arrive at true doctrine from Scripture for this teaching to be true? To my mind it’s hopelessly fuzzy.
I think the key point that distinguishes sola scriptura from acceptable Catholic views on Scripture is not anything that is affirmed about Scripture, but rather what is denied about the Church.
So I think the sources of sola scriptura are at least fourfold:
- Patristic teaching on material sufficiency of Scripture (no, the Fathers are not consistent on this point, but the passages are there, and they are given more weight by the overall Scripture-centered tone of patristic theology)
- Medieval scholastic understanding of the Bible as the ultimate “auctoritas,” the authoritative textbook, for theology. (This makes nonsense of the all-too-common claim of contemporary Catholic apologists that books can’t be authorities. Aquinas would have found this very puzzling.)
- The Renaissance humanist desire to return to the “fontes,” the original sources, in any given discipline, and the accompanying suspicion of medieval traditions of interpretation.
- The increasing suspicion among late medieval radical reformers (most notably Wycliffe and Hus) that the institutional Church was no longer morally, spiritually, and theologically trustworthy.
All of this came together for Luther at Leipzig in 1519, but other Reformers seem to have come to the same conclusions for their own reasons.