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This is descriptive of the life style they were living not prescriptive.
Yes, I agree.
They were obviously living contrary to the instruction of God they had received.
Yes, I agree. This is how we see all those who have departed from the Catholic faith. There was One Faith that was delivered once for all to the one Church. Since that time, many have strayed away from the instruction of God that was received by the Church. This was not the intention of the Reformers, who only wanted a more pure church. Nor is it the intention of their spiritual descendants who have embraced Sola Scriptura, and now live just as those people did - doing what is right in their own eyes, since the authority appointed by Christ was rejected.
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In 2Tim 3:16 Paul doesn’t say Timothy used “apostolic tradition” to find the meaning of scripture. In fact he just says Timothy’s knowledge only came from the scripture. No outside teaching source.
Jesus instructed His apostles in the meaning of the Scriptures. He taught them how to “rightly divide the word of truth”. He showed them how all of the Law and the Prophets pointed to Himself. This instruction, called the Divine Deposit of faith, is what was entrusted to Timothy, just as it was to all the bishops. The duty of the Bishops is to guard what has been entrusted to them. They are to teach it to faithful men who are able to instruct others also. This is the Apostolic Succession.
No one in the early Church read the Scriptures apart from the kerygma.
No, only God is infallible.
Infallibility is the gift of God that prevents humans from making errors. Any human is capable of an infallible act. When a person acts in obedience to God in the movement of His Spirit, they are infallible. For example, when Peter confessed that Jesus is the Christ, Jesus told Him “this was revealed to you by my Father”. He made an infallible proclamation. All the prophets do this when they confess the Word of God. This is part of the foundation of the Church. All the writers of the NT acted infallibly when they penned the Scriptures. The Church councils act infallibly when they make decisions from God and put them into practice, as we seen in the book of Acts at the council of Jerusalem.
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Only 66 books in the canon. Even the Jews who authored those books have serious questions about their inspiration.
They used to, because they thought there were no Hebrew originals. They thought all the Scriptures must be originally written in Hebrew. However, with the discovery of the Dead Sea Scrolls, it became known that the Deuterocanonicals were penned in Hebrew. However, Jesus and the Apostles already knew these books were inspired, which is why they used them to teach, preach, and spread the gospel. When Paul and Peter refer to “the Scriptures”, they are referencing the Septuagint, which contained these books.