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This is the best explanation I could find in lay terms;
“Sacred Tradition is the living and growing truth of Christ contained, not only in Scripture, but in the common teaching, common life, and common worship of the Church. That is why the Tradition that does not change can seem to have changed so much. For this common teaching, life and worship is a living thing-a truth which was planted as a mustard seed in first century Jerusalem and which has not ceased growing since-as our Lord prophesied in Mark 4:30-32. The plant doesn’t look like the seed, but it is more mustardy than ever. And this is an entirely biblical pattern, as we discover when we consider the circumcision controversy in Acts 15.
The Church, of course, began as an almost totally Jewish sect. Its Lord was a Jew, the apostles were all Jews, the first thousands of converts were Jews and the only Bible it had when Gentiles began flooding into the Church were Jewish Scriptures. As delegates of the supposed Bible-only “hidden Church” attending the Council of Jerusalem, let’s try to resolve the question of whether to circumcise Gentiles who want to join the Covenant People. What does Scripture say?
It says the covenant of circumcision is “an everlasting covenant” (Gen 17:7). It says the Patriarchs, Moses and the Prophets are circumcised. It says that circumcision is enjoined, not only on descendants of Abraham, but upon every male who wants to join the Covenant People (Ex 12:48). Period. No exceptions. Moreover, looking around the room we note that the apostles and elders are all circumcised and that the Lord Jesus they preach was circumcised (Lk 2:21). And Jesus himself says that not one jot or tittle of the law would by any means pass away (Mt 5:18) while he is stone silent that Gentiles be exempted from the immemorial requirement of circumcision for all who wish to join the Covenant People.
And so, the Council meets and, in light of all this obvious scriptural teaching, declares…
…that circumcision for Gentiles is against the will of the God who does not change.
Suddenly the whole thing looks perversely Catholic, don’t it? So did apostolic Tradition change Scripture or what?
Nope. It simply acted as a lens and refocused the light of Scripture so that something which had been hidden there was now visible. For, despite appearances, the dogmatic definitions of the Church do not just pop up with absolutely no relation to Scripture. Rather, they assemble the materially sufficient revelation of Scripture using the mortar of Sacred Tradition. And that Tradition is not separate, secret and parallel to Scripture, but the common teaching, life, and worship of the Church. In the case of the Council of Jerusalem, the common teaching from the apostles included the then-unwritten command of Christ to preach the gospel to the whole world (Mt 28:19). It included the as-yet-unwritten common knowledge of Peter’s mystical revelation by the Holy Spirit (“Do not call anything impure that God has made clean” [Acts 10:15]). It included the experiences of Paul and Barnabas in preaching to the Gentiles (Acts 15:12). It is through this Sacred Tradition that James reads Scripture and sees in Scripture, not a judge or “final rule of faith” but a witness to the authoritative decision of the Church in Council. For he says not “we agree with the Prophet Amos” but rather that the words of the prophets “agree with” the Council (Acts 15:15). In short, the Council places the Church on the judge’s seat and the Scripture in the witness box, deriving its revelation not from Scripture alone but from Sacred Tradition and the magisterial authority of the apostles in union with Scripture. And so materially sufficient bricks of Old Testament revelation, which we thought were made to build into a synagogue are stacked and mortared with apostolic Tradition by the trowel of the Church’s magisterial authority, and turn out to make a cathedral instead.
The biblical Council, like the modern Catholic Church, places Scripture in the context of Tradition and magisterial, apostolic authority. The biblical Council, like the modern Catholic Church, speaks with apostolic authority and declares, “It seemed good to the Holy Spirit and to us…” (Acts 15:29). And so, the biblical Council, just like the modern Catholic Church, develops a doctrine which, to “Bible-only” eyes, appears to flatly nullify Scripture yet which, upon closer inspection, turns out to uphold it (Rom 3:31).
“But doesn’t that mean that the Church believes in continuing revelation like the Mormons?” No. The Church believes in Sacred Tradition, not Sacred New Revelation. It is of the very essence of Sacred Tradition that it is a thing handed down from the apostles, not a thing fadged up later on. And one of the basic truths of Sacred Tradition is that “no new public revelation is to be expected before the glorious manifestation of our Lord Jesus Christ” (Second Vatican Council, Dogmatic Constitution on Divine Revelation, 4). And that is the irony. For this dogma, which is at the heart of the Evangelical concern about ongoing revelation, is virtually invisible in Scripture apart from the common teaching, life and worship of the Church…"
Continued next post.