Published online by Cambridge University Press: 22 September 2025
Chapter 7 offers a culminating test for competing rationalities, given how thoroughly Julian’s and Cyril’s texts are focused on re-narrating episodes from their rival. It returns to three specific arguments to consider if MacIntyre’s further claim about incommensurable forms of reasoning obtains in Julian’s and Cyril’s engagement. Three case studies in rationality, focusing on words (genētos, pronoia, and pistis) used by Julian and Cyril at crucial points in their reasoning, provide occasion to query whether non-intersecting forms of reasoning are at play in these specific arguments. Intellectual impasses on particular topics can suggest, after all, that the traditions inhabited by individuals engaged in intellectual conflict are more broadly incommensurable.
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