(19/1/16) We offer our readers an interview to cardinal Gerhard L. Müller, prefect of the Congregation for the Doctrine of the Faith, about doctrine and mercy. The text was published in “Humanitas”, n.80, a three-monthly Christian Anthropological and Cultural Review of the Pontifical Catholic University of Chile, directed by professor Jaime Antúnez Aldunate, who attended the Fifth Congress of the Joseph Ratzinger – Benedict XVI Vatican Foundation, held in Madrid last October.