[farmer matt]

If we toss out Scripture alone, then what is the Church’s doctrine based on?

[Hieronymus]

If we toss out Scripture alone, then what is the Church’s doctrine based on?

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The Church’s doctrine is based upon divine revelation, which is a grace. Some of this revelation was written down by the Church. And, if you are of the mind of St. Augustine, and believe the Church, you then believe the scriptures because the Church says that you should.
“I would not believe the holy Gospels if it were not for the authority of the Holy Catholic Church.” (If you want a work and section citation for the quote from Augustine, I could dig it up, but google isn’t bringing up people for me at the moment who are so precise).

If you want to read the official teaching, here is a link. http://www.vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_const_19651118_dei-verbum_en.htmlChrist taught, the Church

[pgyanke]

If we toss out Scripture alone, then what is the Church’s doctrine based on?

It is based on the Deposit of Faith given Her by Christ Himself. Did you ever notice that you could fill volumes of books with one day's testimony on Capital Hill and yet we get small paragraphs of Jesus's 40 days between His Resurrection and Ascension? There was much more given to the Apostles than what was written (John 21:25). As they themselves noted in the Epistles, they handed on the traditions given them by Christ as they traveled the ancient world (2 Thess 3:6).