Their definitions must be
adhered to with the submission of faith.
This infallibility
with which the divine Redeemer willed his Church
to be endowed
in defining a doctrine of faith and
morals
extends as far as the deposit of divine revelation
which
must be religiously guarded and
faithfully expounded.
This is the infallibility
which the Roman Pontiff, the head of the college
of bishops
enjoys in virtue of his office, when
as the supreme
shepherd and
teacher of all the faithful,