"The Church of Christ, zealous and cautious Guardian of the dogmas deposited with it, never changes any phase of them. It does not diminish them or add to them; it neither trims what seems necessary nor grafts things superfluous . . . but it devotes all its diligence to one aim: To treat tradition faithfully and wisely; to consolidate and to strengthen what already was clear; and to guard what already was confirmed and defined."    – St. Vincent de Lerins: Commonitoria (5th Century)