Just to reiterate, the Catholic Church teaches that while the Bible is a necessity, tradition has a higher and more active role. We need tradition to interpret the Bible properly.
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The Revelation made to the Apostles by Christ and the Holy Spirit, whom He sent to teach them all truth, was final and definitive. To that body of revealed truth, nothing has been, or ever will be, added. The duty of the Apostles and their successors was clear: to guard it jealously, and to transmit it whole and entire to posterity.
St. Paul: “therefore, brethren, stand fast, and hold the traditions which you have learned, whether by word, or by our epistle.” 2 Thess, 2, 14 And again, “hold the form of sound words which thou has heard of me in faith, and in the love which is in Christ Jesus…The things which thou has heard of me by many witnesses, the same commend to faithful men who shall be fit to teach others also” 2 Tim 1, 13
The important consequence of this message, when the Church teaches that a truth, e.g., the doctrine of sin, is revealed by God, she does not mean that God has just now revealed it to her; but, by virtue of her office as the infallible custodian and interpreter of God’s word, she declares that this truth is contained, and always has been contained, in the deposit of revelation committed to her care. In other words, when the Church teaches a revealed truth, she draws upon the ‘sources’ of revelation.
What are these sources? It would be true, in a sense, to say that there is but one source of revelation, namely, divine Tradition. That is, the body of revealed truth handed down from the Apostles; and it is in this sense that St. Paul uses the word when he urges Timothy to “hold the traditions which you have learned, whether by word, or by our epistle.”
Christ may have given his Apostles instructions to write some account of his life on earth, and of the chief points of his teaching. But, the Gospels do not tell us so. Not all of them did, or, if they did their writings have not come down to us. But he did instruct them explicitly to preach the gospel to every creature; and we know (from Paul quoted above) that it was by oral instruction that the revealed word of God was chiefly propagated
St. Paul presupposes as a necessary prerequisite for faith the hearing of the word, and the preaching of the gospel. Tradition which is the source of revelation is divine Tradition.
St, Augustine points to the universal practice of baptizing children as an indication of that the doctrine of original sin is divinely revealed. Many of the theologians of the early Church, known for their sanctity and learning, are called ‘Fathers’. The consensus of these, considered as witnesses to the general belief of the Church, is an indication of the truth which they unanimously hold to be divinely revealed is, in fact, part of the deposit of faith.
The Fathers and theologians are not the teaching authority of the Church, yet they are witnesses to the universal belief of the faithful which is the result of that teaching
There are no proofs for “sola scriptura” followed by Luther and Calvin. It just made their descent from Catholic teaching easier. St. Augustine tells us: “I should not believe the gospel unless I were impelled thereto by the authority of the Catholic Church”
“Credo in unam, sanctam, catholicam, apostolicam Ecclesiam”
Say “Amen” brothers.
“Amen”