Not only were all Christians thus made to feel that it was their highest duty to aid in the extermination of heretics, but they were taught that they must denounce them to the authorities regardless of all considerations, human or divine. No tie of kindred served as an excuse for concealing heresy. The son must denounce the father, and the husband was guilty if he did not deliver his wife to a frightful death. Every human bond was severed by the guilt of heresy; children were taught to desert their parents, and even the sacrament of matrimony could not unite an orthodox wife to a misbelieving husband. No pledge was to remain unbroken. It was an old rule that faith was not to be kept with heretics--as Innocent III. emphatically phrased it, "according to the canons, faith is not to be kept with him who keeps not faith with God." No oath of secrecy, therefore, was binding in a matter of heresy, for if one is faithful to a heretic he is unfaithful to God. Apostasy from the faith is the greatest of all sins, says Bishop Lucas of Tuy; therefore if any one has bound himself by oath to keep the secret of such inexplicable wickedness, he must reveal the heresy and perform penance for the perjury, with the comfortable assurance that, as charity covereth a multitude of sins, he will be gently dealt with in consideration of his zeal.[201] Thus the hesitation as to the treatment of heretics which marked the eleventh and twelfth centuries disappeared in the thirteenth, when the Church was involved in mortal struggle with the sectaries. There was no pretence of moderation, and, save in the technical adjuration for mercy, no attempt to evade the responsibility. St. Raymond of Pennaforte, the compiler of the decretals of Gregory IX., who was the highest authority in his generation, lays it down as a principle of ecclesiastical law that the heretic is to be coerced by excommunication and confiscation, and if they fail, by the extreme exercise of the secular power. The man who was doubtful in faith was to be held a heretic, and so also was the schismatic who, while believing all the articles of religion, refused the obedience due to the Roman Church. All alike were to be forced into the Roman fold, and the fate of Korah, Dathan, and Abiram was invoked for the destruction of the obstinate.[202]