The Bible couldn’t possibly have been seen as the sole rule of faith for the next 1100 to 1200 years, either. Not everyone had their own Bibles (and even if they did, most couldn’t read them).
From
this link:If God had intended the individual Christian to use sola scriptura as his operating principle then it would have to be something the average Christian could implement. …
Not only that, but since God promised that the Church would never pass out of existence (Matt. 16:18, 28:20), the normal Christian of each age must be able to implement sola scriptura, including the crucial patristic era, when the early Church Fathers hammered out the most basic tenets of Christian orthodoxy. …
First, if each Christian is to make a thorough study of the Scriptures and decide for himself what they mean (even taking into consideration the interpretations of others) then it follows that he must have a copy of the Scriptures to use in making his thorough study (a non-thorough study being a dangerous thing, as any Protestant apologist warning one against the cults and their Bible study tactics will tell you). Thus the universal application of sola scriptura presupposes the mass manufacturing of books, and of the Bible in particular. …
Second, besides the printing press, sola scriptura also presupposes the universal distribution of books and of the Bible in particular. For it is no good if enough copies of the Bible exist but they can’t be gotten into the hands of the average believer. There thus must be a distribution network capable of delivering affordable copies of the Bible to the average Christian. … However, in the great majority of Christian history, the universal distribution of books would have been totally impossible even in the what is now the developed world. During most of Church history, the “developed world” was undeveloped. …
Third, if the average Christian is going to read the Scriptures and decide for himself what they mean then he obviously must be able to read. Having someone read them to him simply is not sufficient, not only because the person would only be able to do it occasionally (what with a bunch of illiterates to read to) … He therefore must be literate and able to read for himself. Thus sola scriptura presupposes universal literacy.
Fourth, if the average Christian is going to make a study of what Scripture says and decide what it teaches, he must possess adequate scholarly support material, for he must either be able to read the texts in the original languages or have material capable of telling him when there is a translation question that could affect doctrine … He must also have these scholarly support works (commentaries and such) to suggest to him possible alternate interpretations to evaluate, for no one person is going to be able to think of every interpretive option on every passage of Scripture that is relevant to every major Christian doctrine.
Fifth, if the average Christian is to do a thorough study of the Bible for himself, then he obviously must have adequate time in which to do this study. If he is working in the fields or a home (or, later, in the factory) for ten, twelve, fifteen, or eighteen hours a day, he obviously doesn’t have time to do this … Not even a Sunday rest will provide him with the adequate time, for nobody becomes adept in the Bible just by reading the Bible on Sundays—as Protestants stress to their own members when encouraging daily Bible reading. Thus sola scriptura presupposes the universal possession of adequate leisure time in which to make a thorough study the Bible for oneself.
Sixth, even if a Christian had adequate time to study the Bible sufficiently, it will do him no good if he doesn’t have a diet sufficiently nutritious to let his brain function properly and his mind work clearly. … for most of Christian history the average person had barely enough food to survive, and it was almost all bread. “Everything else,” as the British historian James Burke put it, “was just something you ate with bread”—as a condiment or side-dish. This means that the average Christian of world history was malnourished, and … malnutrition causes an inability to study and learn properly. … Thus sola scriptura also presupposes universal nutrition.
Seventh, if the average Christian is going to evaluate competing interpretations for himself then he must have a significant amount of skill in evaluating arguments. He must be able to recognize what is a good argument and what is not, what is a fallacy and what is not, what counts as evidence and what does not. That is quite a bit of critical thinking skill … [that] does not exist in the average, literate, well-nourished, modern college senior, much less the average, illiterate, malnourished, Medieval peasant. …
What this means, since God does not ask a person to do what they are incapable of doing, is that God does not expect the average Christian of world history to use sola scriptura. He expects the average Christian to obtain and maintain his knowledge of theology in some other way.
But if God expects the average Christian to obtain and maintain the Christian faith without using sola scriptura, then sola scriptura is not God’s plan.
So… what’s your authority, if not the Bible Alone?