Pope St. Hormisdas, “Inter Ea Quea” to the Bishops of Spain, April 2, 517: “[Our] first safety is to guard the rule of the right faith and to deviate in no wise from the ordinances of the Fathers; because we cannot pass over the statement of our Lord Jesus Christ who said: ‘Thou art Peter and upon this rock I will build my church’ . . . [Matt. 16:18]. These [words] which were spoken, are proved by the effects of the deeds, because in the Apostolic See the Catholic religion has always been preserved without stain. Desiring not to be separated from this hope and faith and following the ordinances of the Fathers, we anathematize all heresies...”