Whether something is extra-Biblical is irrelevant, again, there was no New Testament, and no Bible, until the late 300s when the Catholic Church formally gave the world the Bible. It then became a formal Catholic teaching, now the books of the Bible were God-breathed when those books were written, but the Catholic Church did not make a formal declaration until centuries later. Of course, the Word of God cannot contradict the Word of God, so the teachings would not contradict previous teachings, and thus not contradict the 73 books of the Bible.
Thank you for answering my question. Thus, any and every idea that was floating around prior to the late 300's can be embraced as Christian dogma, as long as there is nothing in the Bible to contradict it.
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