Any more commentary is hardly necessary. We would hope that, in essence, Paul's message was always the same, namely the Gospel. We must keep this in mind as we analyze the Protestant criticism of the Catholic position. Yet the rules of semantics suggest otherwise. One ought to compare Sola Scriptura to a state that issues a constitution.
Any state needs a legislative branch in the government to interpret the meaning of the constitution.
After all, it's the government's book. We would have chaos and anarchy if each person in the US could interpret the Constitution by themselves. We would have no rules. The same applies to Sola Scriptura . ONLY, there are lots of different opinions on what it means.