This is what is called a category mistake. Here you are saying, because Rome teaches something that is not correct, no teaching of Rome can be correct. Or put another way, because Rome is not perfectly reliable, no judgment of Rome can be reliable. It would be the same mistake if I were say that because the Reformers taught the solas, they're incapable of recognizing Mormonism as inauthentic apostolic teaching.
Aside from being a logical fallacy, it's also an incorrect understanding of my premise - namely to say I am not calling upon Rome as a formal authority to recognize a new teaching. It is not Rome's pronouncement that carries weight - it is simply whether this was taught in Rome or not. I am looking to the historical witness of Rome's teaching as evidence, not their formal statements. The statements are not necessary, in that sense. A teaching that is normative and historical to the apostles must by definition be found in history, and it must be taught publicly. This is and has always been how authentic teaching has been judged in the Church (1 Tim 1:13, 2 Tim 2:2, witnessed by St Irenaeus in Adv. Her. III.4, III.24, St Vincent as earlier noted, and so on).
The fact that sola scriptura, that the scriptures are the sole authority, etc., simply has no historical basis for being a normative, public teaching of the Church. Not in the West, using "Rome" as shorthand, and not in the East.
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It's a definition you've tried to push through as acceptable and it's not a definition I'm willing to accept. Doctrinal development should be expected. New challenges and new issues do come up and stunting the discussion with your "everywhere always by all" only leaves you out of the discussion.
But further, under that logic, basically nothing is relevant because most everything has been challenged at one point or another, hence the need for development.
it's not my definition, it is a definition of St Vincent of Lerins, but even then it isn't his definition as he is clearly repeating what he has been taught as how the Church understands it. This is a person recognized East and West as a saint, in a text that is reliable and preserved and oft quoted, and a common approach to explaining. In other words, reject it as you like, but it's very orthodox.
Further, you misunderstand it, because it doesn't preclude doctrinal development. The point is that doctrinal development is only explanation and expansion on existing teachings. Never new. The same saint who explained "everywhere, always, by all" exalts it the necessity of doctrinal development:
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In like manner, it behooves Christian doctrine to follow the same laws of progress [as things in nature], so as to be consolidated by years, enlarged by time, refined by age, and yet, withal, to continue uncorrupt and unadulterate, complete and perfect in all the measurement of its parts, and, so to speak, in all its proper members and senses, admitting no change, no waste of its distinctive property, no variation in its limits...
Therefore, whatever has been sown by the fidelity of the Fathers in this husbandry of God's Church, the same ought to be cultivated and taken care of by the industry of their children, the same ought to flourish and ripen, the same ought to advance and go forward to perfection. For it is right that those ancient doctrines of heavenly philosophy should, as time goes on, be cared for, smoothed, polished; but not that they should be changed, not that they should be maimed, not that they should be mutilated. They may receive proof, illustration, definiteness; but they must retain withal their completeness, their integrity, their characteristic properties.
The fact that heresy exists, that teachings have been challenged, does not violate the standard. I mean, clearly St Vincent understands that teachings have been challenged by heresy because he's explaining how to identify heresy from orthodoxy. He gives two ways: "first, by the authority of the Divine Law, and then, by the Tradition of the catholic Church."
"Everywhere, always, by all" isn't to say that if one person dissents nothing can be affirmed. This is silly. He expands on it to say we follow the rule if we observe what the Church throughout the world confesses, what has been publicly and generally known to be held by the fathers, and if we adhere to the consensus of the Church on definitions and determinations.
So just here for example we see that sola scriptura is at odds with St Vincent. He does not recognize whatever that scripture is a sole authority, but is bound to and properly framed by the interpretation that comes to us by Tradition. If this teaching - which is in line with the exhortations to preserve public teaching in the scripture - was preserved and echoed for a thousand years before the Reformation, how can we say that a teaching which absolutely and clearly negates it was always taught?