Crucifiers of Christ ought to be held in continual subjection.

God forbid that all children, of whom daily so great a multitude die, would perish, but that also for these, the merciful God, who wishes no one to perish, has procured some remedy unto salvation.

Kill them all, for God knows His own.

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.

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.

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

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