To define theological interpretation, this article appeals to Augustine's De doctrina christiana. The article argues against the claim that De doctrina is a rhetorical handbook and asserts instead that the treatise can best be described as an ‘expanded hermeneutics’, that is, a hermeneutics that includes rhetoric. The discussion highlights that rhetoric is defined loosely as ‘communication’: the focus is on the target audience, not the mode of delivery. De doctrina is put into dialogue with a contemporary proponent of theological interpretation, Stephen Fowl, to highlight its distinctiveness. The article concludes that the paradigm for theological interpretation is the sermon.