Are you saying that this is the scripture that determines that we can only act or believe in something if it is specifically in the Bible?
Even if that were the case, I don't see how it would be even be possible. If in Joel Osteen only mentioned biblical passages in 5% of his sermon and the rest is interpretation (which is very good by the way), How do I disregard the 95%?
A text that is very pertinant to the issue of Oral Tradition is St. Pauls letter to the Thessalonians were we read: 2Thes 2:15
'Therefore brethren, stand fast, and hold the Traditions which ye have been taught, whether by WORD, or our Epistle'.
I won't say sola scriptura. But I will say that this scripture says that even given a limited subset of the scriptures, they were more trustworthy than the apostles very words. This is just one of the many places where the scriptures are highly honored. Yet on the original topic, you just don't see this of Mary. Mary is so secondary to the idea of protties pleading with RCs to honor the scriptures.