It is Taught, ‘Man cannot live by bread alone, but ALSO by every word that comes from the Chair of Peter and some utterings by unnamed apparitions; too.’
(And be sure not to neglect or forget any beating heart Hosts!)
Faith comes through hearing.
Roman chapter 10.
The church has teaching authority. Bible alone is a Protestant tradition.
Remember that we compiled the canon of the Bible from all of the books floating around claiming to be scripture. There is no list of books in the Bible itself. You already rely on the teachings of the Catholic Church by referring back to our book.