According to the theory of "Holy Tradition," it would be God speaking to the church if the "tradition" were continuous from the Apostles, the consensus of the Church at all times, and believed throughout the churches (as opposed to being a local custom or legend, etc.).
First, it's not a theory. Sacred Tradition is the oral teaching of Jesus Christ handed down to his apostles, who in turn handed it down to their disciples (the early Church Fathers), and then to the next generation, and then finally to us. How do we know this? Well, for almost 400 years there was no written New Testament to fall back on. All of the apostles and disciples taught orally for the first 400 years. Yes, you might say, but didn't Paul, Peter, John, Luke, etc., write everything down in their epistles and gospels? Yes, they did, but none of it was widely available to geographically separated disciples and it wasn't part of "The Bible" until the Councils of Rome, Hippo, and Carthage put the 27 books of the New Testament together in 382 AD, 393 AD, and 397 AD. At that time, it took on the mantle of infallible scripture with the Old Testament. Interestingly, Protestants today accept this Catholic "Tradition" of these 27 books of the Bible being divinely inspired. Protestants also accept the Catholic Tradition of meeting on Sunday, rather than the Jewish custom of meeting on Saturday.
And this is the reason "Holy Tradition" isn't genuine. In addition to an absence of any guidance from Scripture that there is such a second stream equal to Scripture...the defining characteristics identified above are almost always absent. But the dogmatizing of new doctrines goes on anyway, always with the claim that the church always believed it, even though it hadn't.
There are some instances of Sacred Tradition in the Bible that are interesting. For instance, in Acts 20:35, Paul says the following:
"In all things I have shown you that by so toiling one must help the weak, remembering the words of the Lord Jesus, how he said, `It is moreblessed to give than to receive.'"
These words are not recorded anywhere else in the Bible, including the 4 gospels, so this is one example of an oral teaching of Jesus being handed on to Paul,who hands it down to us.
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