The universal Church of the faithful is one outside of which none is saved.

Kill them all, for God knows His own.

This [Magna Carta] has been forced from the King. It constitutes an insult to the Holy See, a serious weakening of the royal power, a disgrace to the English nation, a danger to all Christendom, since this civil war obstructs the crusade. Therefore?we condemn the charter and forbid the King to keep it, or the barons and their supporters to make him do so, on pain of excommunication.

So much must I live for others, that almost I am a stranger to myself.

It is necessary to obey a Pope in all things as long as he does not go against the universal customs of the Church, but should he go against the universal customs of the Church, he need not be followed.

The mysteries of the faith are not to [be] explained rashly to anyone. Usually in fact, they cannot be understood by everyone but only by those who are qualified to understand them with informed intelligence. The depth of the divine Scriptures is such that not only the illiterate and uninitiated have difficulty understanding them, but also the educated and the gifted.

Crucifiers of Christ ought to be held in continual subjection.