RT Article T1 A Commentary on the First Vatican Council’s Dei Filius JF Irish theological quarterly VO 81 IS 2 SP 138 OP 151 A1 Allen, Jeffrey A. LA English PB Sage YR 2016 UL https://ixtheo.de/Record/156109529X AB This article provides an overview of the characterization of the relationship between faith and reason in the First Vatican Council’s Dei Filius. Key passages are highlighted, and important and/or confounding elements of those passages are clarified and elaborated on. The article aims to offset the scarcity of English-language scholarship on the document so that a wider number of persons are able to carry out an informed appropriation of it. DO 10.1177/0021140015625236