All Paul was aware of was that he was writing letters, that included Apostolic teachings. It is why Catholics value his letters, and why they became scripture.
Are you reading and understanding what I am writing? My answers are straight from the shoulder and completely honest. What is it about them you are not understanding?
I have read Protestant criticisms of Catholic practices. I have read Catholic and historic explanations of Catholic practices. After decades of this, it is clear that Protestant criticisms/interpretations of scripture date back to the fifteen hundreds and are based on a modern language not Biblical languages. They even have some of the etymology changes in the English language incorrect.
You say you want the truth. The truth does not lie in the 1500s and modern English. The truth lies in Apostolic times and Biblical languages.