Through close and sustained analysis of Augustine’s exegesis of Scripture, Robinson argues that Augustine’s Trinitarian exegesis offers significant—though not inexhaustible—support for Rahner’s Trinitarian project and, particularly, his Grundaxiom. Firstly, he posits that Augustine provides weighty, biblically rich, support for Rahner’s Trinitarian agenda at exactly those points where Rahner is explicitly critical of Augustine and the “Augustinian-Western tradition”, overcoming various weaknesses detected in the later tradition, and pre-empting many of Rahner’s later solutions. Secondly and consequently, Robinson suggests that Augustine offers a scriptural reading strategy that addresses the major exegetical difficulties perceived to emerge from Rahner’s Rule. Thus, in Augustine’s exegesis of Scripture, the Augustinian-Western tradition has always had the resources at its disposal to avoid or address the most poignant criticisms levelled both by and at Rahner.