Who else is the sole authority for teaching? You? It can't be the Bible. Protestants have proven this to absolutely 100% wrong.8 To me, the very least of all [d]saints, this grace was given, to preach to the Gentiles the unfathomable riches of Christ, 9 and to [e]bring to light what is the administration of the mystery which for ages has been hidden in God who created all things; 10 so that the manifold wisdom of God might now be made known through the church to the rulers and the authorities in the heavenly places.
If you go back to the first of the book and even to the first of this chapter you can see this is speaking about the Gentiles being brought into the family (church) of God. This is not speaking of the church going forth as the catholic faith suggest and teach the gospel apart from Man teaching (whom they claim can not). Their thoughts are the church RCC is the sole authority for teaching if you have followed their post which im sure you have.
Again you seem to be stirring the pot alittle here.
You seem to think that Paul was not part of the Universal Church. Of course he was. He had the authority to teach and he passed this authority to Timothy and Titus at the least. He went to the other Church leaders to get the answer on whether Gentile converts had to be circumcised at the Council of Jerusalem.
Peter ,Paul and the other 10 were all Catholics. Period.
There is no other history you can point to that says otherwise.