36 As he trusted to God's grace, so too did he rely upon the authority of his predecessors: "What I have learned I did not teach myself - a wretchedly presumptous teacher! - but I learned it from illustrious men in the Church." Again: "In studying Scripture I never trusted to myself." To Theophilus, Bishop of Alexandria, he imparted the rule he had laid down for his own student life: "It has always been my custom to fight for the prerogatives of a Christian, not to overpass the limits set by the Fathers, always to bear in mind that Roman faith praised by the Apostle."
Source: Spiritus Paraclitus (Vatican.va)