Note 25 — Chapter VIII
Reading edition
“We excommunicate and condemn every heresy, which exalteth itself against this holy and Catholic Faith. Let such persons, when condemned, be left to the secular powers, to be punished in a fitting manner. And let the secular powers be admonished, and, if need be, compelled, that they should set forth an oath, that to the utmost of their power, they will strive to exterminate all heretics, who shall be denounced by the church. But if any temporal lord shall neglect to cleanse his country of this heretical filth, let him be bound by the chain of excommunication. If he shall scorn to make satisfaction, let it be signified to the supreme pontiff, that he may declare his vassals to be absolved from their fidelity.” Labb. et Coss. Tom. xi. 147-9. This canon was also received into the Canon Law, by Gregory IX. It was carried into effect against the Albigenses.