The Earnest of Our Inheritance (Eph 1:5): The Biblical Foundations of Thomas Aquinas’ Soteriology

From the perspective of Aquinas’ Biblical commentaries, the article develops the reflection on pignus / arra haereditatis (Eph 1:5) seeing these essential elements of Thomas’ reflection on salvation in the terminological question of which one is better: pignus or arra, namely the pledge or the earnest/deposit. Thomas develops soteriology, which indicates that human salvation starts “now” and not “later,” through the participation in the Passion of Christ and in His merits. Analyzing Aquinas’ commentary on Ps 21, on the Letter to the Ephesians and on the Letter to the Galatians together with the themes of Christ’s obedience and its soteriological significance as well as His wish of voluntary death for us, the article shows the Biblical roots of Thomas’ soteriology. The author devotes particular attention to the analysis of the logic of inchoatio and consummatio in Thomas’ soteriological grammar and his understanding of faith as the beginning of eternal life and the ensuing consequences.