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 now 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.
Writings; Writings; Commonitories; Grace and Free Will (ed. CUA Press, 2008) - ISBN: 9780813215532