If it shall be necessary, through sentences of excommunication against their persons and of interdict against their lands, all backsliding being put an end to, they compel them to fulfil their vows.

We believe that the Greeks have been punished through [the Crusades] by the just judgement of God: these Greeks who have striven to rend the Seamless Robe of Jesus Christ ... Those who would not join Noah in his ark perished justly in the deluge; and these have justly suffered famine and hunger who would not receive as their shepherd the blessed Peter, Prince of the Apostles.

Every cleric must obey the Pope, even if he commands what is evil; for no one may judge the Pope.

Kill them all, for God knows His own.

Not to oppose erroneous doctrine is to approve of it, and not to defend at all true doctrine is to suppress it.

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.