Councils of Florence and of Trent, by the schismatics and heretics of the age, to their own loss and the spiritual ruin of a great number.”13 Pope Leo XIII similarly affirmed the assent and obedience owed by Catholics to the enactments of a general council: “There can be no doubt that the decisions of the Holy See or those of the General Councils, above all in matters of faith, are by themselves and by their very nature, obligatory on all the faithful.”14 Let us note well that Leo XIII says not “only”