“…someone may ask, is not the canon of Scripture sufficient for everything, and why should we add thereto the authority of Tradition? This is because not everyone understands the Scriptures in the same way, but one explains them this way and another that way, so that it is possible to get therefrom as many thoughts as there are heads. Therefore it is necessary to be guided by the understanding of the Church.”

(St. Vincent of Lerina, Notes of a Pilgrim)