As Modernist doctrines emphasizing the unity and agency of the educated self are increasingly set up as the straw men of contemporary educational discourses, premodern and Medieval theories of selfhood tend to disappear from the horizon of educational thought altogether. In this essay, in order to subvert this overcoming of our intellectual past, I examine Thomas Aquinas' reading of the doctrine of original sin. Relying on Graham McAleer's claim that Aquinas' metaphysical theory sanctifies the body, I argue that Aquinas' understanding of original sin relies on a discursive, pedagogical model to account for human finitude.