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Actually, Itwin is correct that all doctrine should be grounded in the Bible.
This is because Divine Revelation is found in the Bible, especially through the teachings of Jesus Christ.
The issue has more to do with what an individual reader,such as Itwin, perceives the Bible saying. Of course Catholics see the Immaculate conception and the role of the successor of Peter grounded in scripture, but that is because we understand what is written differently.
As for “using a canon that is not described in Scripture”, I must be slow because the Catholic Church uses “canon” as meaning the finished list of books that are proper for the Holy Bible.
You are not “slow”.
Yes, this is the use of the word in this context. That list of books is not part of the text considered the inspired and infallible Word of God by our separated brethren.
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I cannot wrap my mind around a "canon" which is in Scripture centuries before the Catholic Church determines the "canon" of what belongs in the Holy Bible.
Canon of Scripture is the correct designation for the Church’s complete list of sacred books which includes 46 books for the Old Testament (45 if Jeremiah and Lamentations are counted as one) and 27 for the New Testament.
This “canon” was developed through Sacred Tradition, and is considered part of the doctrine of the faith. And yet, it is not contained in any of the Holy Writings that make up our Bible. Which Bible our separated brethren accept as completely inspired and inerrant.
Getting back to Itwin’s correct comment that all doctrine should be grounded in Scripture.
There is a caveat here. He is saying that it should be grounded according to his own expectations and perceptions. If HE does not “see” it there, then according to him it is not grounded.
If Itwin does not read Jesus saying to Peter “feed and care for my flock” as the Petrine gifts now belonging to the Successor of Peter in Rome, then from his perspective, the Papacy is not “grounded in Scripture”.
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He is also correct that a private individual can discern doctrines in Scripture.
Oh without a doubt!
Calvin discerned the TULIP.
The Mormons discern that Jesus is actually Michael the Archangel.
The Seventh day adventists discern that Catholics have committed Apostasy from the Church founded by Christ because we do not observe the Sabbath on Saturday. There is no limit to the number of doctrines a private individual can discern in Scripture!
Furthermore, this comment "You keep insisting that all doctrine should be grounded in Scripture (such that you as a private individual can discern it) and yet in practice you violate this man made tradition… " needs clarification
I hope this post will clarify the point I am trying to make.
The Catholic Church’s insistence that all doctrines should be grounded in Scripture is not a man made tradition.
Sola Scriptura is the man made tradition to which I am referring. SS places the individual reader in a position to “discern” over and above what the HS has revealed to the Church, what the Scripture is saying.