SAINT ATHANASIUS DIXIT

 "It will always be beneficial to strive to deepen the content of the ancient tradition, the doctrine and faith of the Catholic Church, as the Lord handed it down to us, as the apostles preached it, and as the Holy Fathers preserved it. Indeed, on it is the foundation of the Church, so that anyone who departs from this faith ceases to be a Christian and no longer deserves the name."

Saint Athanasius, Epistle to Serapion.