What Cannot and Can be reformed in the Catholic Churchby Fr. Michael Mueller, 1875
http://catholicharboroffaithandmorals.com/What%20Every%20Christian%20Must%20Do%20Main.html"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; it neither gives up its own or usurps what does not belong to it. But it devotes all its diligence to one aim: to treat tradition faithfully and wisely; to nurse and polish what from old times may have remain unshaped and unfinished; to consolidate and strengthen what already was clear and plain; and to guard what already was confirmed and defined."
(St. Vincent of Lerins, 5th century A.D.)
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