The Catholic Church has
infallibly defined the interpretation
of Matthew 16.
Council of Ephesus, 431 AD
one doubts, in fact, it is obvious to
all ages that the holy and most
Peter, head and Prince of
the pillar of faith, and
of the Catholic Church,
keys of the kingdom from our
Christ, the savior and redeemer
When there is error or
misunderstanding, the teaching authority
of the Church is appealed.