A recent commentary by Professor Roberto de Mattei suggests that Cardinal Víctor Manuel Fernández, prefect of the Dicastery for the Doctrine of the Faith, is both incompetent and a liar. The column recounts a verbal exchange between Diane Montagna and Fernández regarding the doctrinal note Mater Populi fidelis. Responding to the Montagna , Cardinal Fernández explained that the statement contained in no. 22 of the doctrinal note Mater Populi fidelis—according to which “it is always inappropriate” to use the title “Co-redemptrix” to define Mary’s cooperation in Christ’s work of Redemption—refers exclusively to the official use of the title “Co-Redemptrix,” that is, in liturgical texts and documents of the Holy See, but does not extend to private devotion or theological discussions among the faithful. The central point of the interview concerns the meaning of the expression “always inappropriate” in reference to the title of Co-Redemptrix. Diane Montagna asks whether the term, …