“The doctrine of the Faith which God has revealed is not proposed like a theory of philosophy to be elaborated by the human understanding, but as a divine deposit delivered to the spouse of Christ to be faithfully guarded and infallibly declared…. That sense of the sacred dogmas is to be faithfully kept which Holy Mother Church has once declared, and is not to be departed from under the specious pretext of a more profound understanding.”

(Const. De Fid. Cath. C. iv.)