On 30th April, 1921, Pope Benedict XV published his Encyclical In Praeclara Summorum to Professors and Students of Literature and Learning in the Catholic World on Dante:
"6. ...And indeed, since, through mortal infirmity, "by worldly dust even religious hearts must needs be soiled" (St. Leo M. S. IV de Quadrag), it cannot be denied that at that time there were matters on which the clergy might be reproved, and a mind as devoted to the Church as was that of Dante could not but feel disgust while we know, too, that reproof came also from men of conspicuous holiness. But, however he might inveigh, rightly or wrongly, against ecclesiastical personages, never did he fail in respect due to the Church and reverence for the "Supreme Keys"; and on the political side he laid down as rule for his views "the reverence which a good son should show towards his father, a dutiful son to his mother, to Christ, to the Church, to the Supreme Pastor, to all who profess the Christian religion, for the safeguarding of truth" (Mon. III, 3)."