Gregorij de Valentia oratio,

part of the doctrine of faith, if persistence is added, makes them heretics and therefore exiles from the true Church of Christ, outside of which there is no salvation. Unless, perhaps, the Sectarii sectarians either do not know or do not believe the symbolum creed/profession of faith of the divine Athanasius. For what could have been said more clearly by him on this matter? "Whoever," he says, "wishes to be saved, before all things it is necessary that he hold the Catholic faith, which unless he shall have kept entire (entire, he says) and inviolate, without doubt he shall perish eternally." If this is not so, why do the Sectarii themselves also, even for one or another error, customarily proclaim each other heretics? Do not most of them consider Illyricus (to name one) to have taught heretically even for the sole reason that he contends that original sin is a substance? Will they not also think that someone who now stubbornly persuades himself of this opinion of Illyricus is going to perish eternally, for the reason that he has not kept the Catholic faith entire and inviolate, as Athanasius says? And yet, there is nothing about original sin in that creed of the divine Athanasius. From which example, and from many others, which I omit partly to consult brevity and partly to spare the shame of my adversaries in this place, Read especially the divine Cyprian, Book 6, Epistle 1, to Magnus.