I know very well that in Romans 3 the word solum is not in the Greek or Latin text – the papists did not have to teach me that. It is fact that the letters s-o-l-a are not there…Please do not give these donkeys [papists] any other answer to their useless braying about the word sola than simply this: “Luther will have it so, and he says that he is a doctor above all the doctors of the pope.”
Luther's Open Letter on Translating
Placemarker
Protestants are hypocrites when they protest papal infallibility or ecclesiastical infallibility for that matter because they implicitly declare their individual infallibility when it comes to interpreting scripture.
Individual fathers or doctors may err, but a matter is only infallible if it is a matter of universal consent like the real presence, the Divinity of Christ, etc.
It’s like the difference between a soloist and an orchestra.
The soloist is fallible while the orchestra is infallible. That’s the best analogy for describing catholicity.
The individual Protestant who reads his or her Bible is like a soloist.