You misunderstood what the "it" in the question is. Rather typical of all Protestant sects, to defend their heresies with quotes that do not support them, and ignore the quotes that condemn them. The cure for Protestantism is simple: read the Holy Bible every once in a while and attempt to understand what you are reading.
the Roman church teaches all manner of things not much supported by Scripture, even frequently to the contrary of Scripture
No, not "contrary", in the doctrinal part. In manners of discipline, yes, disciplines changed since the 1c. If you believe otherwise, give me an example. If you want to drop this topic, you have a right to do so, of course, on the thread about Purgatory. However, the question was, where does the scripture condemns teaching on the subject not covered by the scripture. Useful meaning-of-words hint: when something contradicts the scripture that means the scripture covers it.
What sins are NOT covered by the blood of Jesus?
Every single one of them is redeemed by the blood of Christ, of course. That is somehow related to the issue of Purgatory? Those in purgatory are there because of the redemption wrought by Christ. If you do not understand that, you do not understand either the Purgatory or the mission of Christ.
Ridiculous. Doctrines have risen over the centuries which did not exist from the beginning, in fact at times were spoken against quite directly and clearly by the earliest theologians. Examples of such have played out on these pages FOR YEARS. I've been here for quite some time...
Must we rehash the evidence that has been supplied on these pages countless times? Or barring that, being that it is arguably beyond reasonable human effort for us to do so, here on this thread --- must I now be required to ignore all of which has discussed if not thoroughly dissected concerning certain particularly Romish doctrines?
No sir, I did not, but rather was consistent in holding the position that "Purgatory" was not a doctrine handed down to us, evidenced by the Word. That portion which you did cite as being supportive, one must needs have a priori acceptance of the idea, before being able to "see" much in the way of alleged support.
Otherwise, one's works, being tested by fire could just as well vanish in an instant, as much as one being held in some form of suspended state where they must "purge", be forced to vomit up whatever it is within them which can be found contrary to the God.
By which I mean, not only is the citation you bring in support much less than clear --- concerning RCC defined "Purgatory" --- but we do not find much elsewhere in Scripture to support the idea on it's own, it's insidious inclusion and reliance upon as some foundational cornerstone, incorporated into the overall logic, notwithstanding.
You are not claiming that Purgatory (as doctrinal truth) was part of "oral tradition", handed down to us directly from Christ and the Apostles, now are you?
But instead are relying upon "the teaching authority", where the oral tradition utilizes not what was directly passed by the original authorities, but by some later theologians whom proclaim to have found threads of otherwise "hidden" meanings, deeply subsumed in the texts, and only teased out through inference & interpretation? Which then enter the narrative under the cover of "oral tradition" presumed to have been directly handed down by Christ & the Apostles ---
---Until the covers get pulled back on that train of events (and we see the tracks!) to which then the "teaching" is said to fall under the magisterium, the teaching authority of the church, etc., led flawlessly by the Spirit --- resulting in those who question all of THAT being accused of first heresy, then outright blasphemy of the Spirit.
We've all been on this merry-go-round before, I will submit...there is not much new under the sun, on the pages of the FR RF.
The Scriptures forbid teaching "new" Gospels (good news). Reading between the lines, to find new, additional ideas not previously, clearly expressed, is shaky theological construction, risky at best, quite fraudulent and something destined for the fire itself at worst. This "Purgatory" idea, appears to be quite possibly, one of those...
The same could be proscribed as cure for Roman Catholicism. Studying history closely could help too. But one would need distance themselves from Romish apologetic- spewing guides a bit, to have clearer view of it all.