Kind of odd that I didn’t get a reply regarding the nonbiblical origin of sola scriptura. Hmmm..
See my post 73.
The primary Catholic argument against sola scriptura is that the Bible does not explicitly teach sola scriptura. Catholics argue that the Bible nowhere states that it is the only authoritative guide for faith and practice. While this is true, they fail to recognize a crucially important issue. We know that the Bible is the Word of God. The Bible declares itself to be God-breathed, inerrant, and authoritative. We also know that God does not change His mind or contradict Himself. So, while the Bible itself may not explicitly argue for sola scriptura, it most definitely does not allow for traditions that contradict its message. Sola scriptura is not as much of an argument against tradition as it is an argument against unbiblical, extra-biblical and/or anti-biblical doctrines. The only way to know for sure what God expects of us is to stay true to what we know He has revealed—the Bible. We can know, beyond the shadow of any doubt, that Scripture is true, authoritative, and reliable. The same cannot be said of tradition.
Sola scriptura does not nullify the concept of church traditions. Rather, sola scriptura gives us a solid foundation on which to base church traditions. There are many practices, in both Catholic and Protestant churches, that are the result of traditions, not the explicit teaching of Scripture. It is good, and even necessary, for the church to have traditions. Traditions play an important role in clarifying and organizing Christian practice. At the same time, in order for these traditions to be valid, they must not be in disagreement with God’s Word. They must be based on the solid foundation of the teaching of Scripture. The problem with the Roman Catholic Church, and many other churches, is that they base traditions on traditions which are based on traditions which are based on traditions, often with the initial tradition not being in full harmony with the Scriptures. That is why Christians must always go back to sola scriptura, the authoritative Word of God, as the only solid basis for faith and practice.
Again, traditions are not the problem. Unbiblical traditions are the problem. The availability of the Scriptures throughout the centuries is not the determining factor. The Scriptures themselves are the determining factor. We now have the Scriptures readily available to us. Through the careful study of God’s Word, it is clear that many church traditions which have developed over the centuries are in fact contradictory to the Word of God. This is where sola scriptura applies. Traditions that are based on, and in agreement with, God’s Word can be maintained. Traditions that are not based on, and/or disagree with, God’s Word must be rejected. Sola scriptura points us back to what God has revealed to us in His Word. Sola scriptura ultimately points us back to the God who always speaks the truth, never contradicts Himself, and always proves Himself to be dependable.
More at the link: https://www.gotquestions.org/sola-scriptura.html