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,