The article examines the influence of Aristotelian rhetorical theory on the epistemology of Newman. This influence is established on historical grounds and by similarity of content. Specifically, the article sheds light on how the rhetorical notions of ethos, logos, and pathos are all implicitly incorporated into Newman’s theory of knowledge concerning the concrete. The section on rhetorical ethos focuses on Newman’s appeal to the “prudent man.” Concerning logos, particular attention is paid to the rhetorical enthymeme and in what sense Newman’s method of argument can justifiably be described as enthymematic. Pathos, in turn, is shown to be significant for the way in which Newman views the subjective dimension of the individual’s coming to knowledge. The rhetorical rationality that emerges sets the stage for clarifying, in another context, other more theological themes in Newman’s writings, such as his religious apologetic, his understanding of tradition, and even his Christology.