Since rationality requires that one's beliefs reflect one's evidence, endorsing a belief while simultaneously affirming one's evidence undermines it produces a self-defeating doxastic state that no coherent epistemic agent can occupy.

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Doxastic(as used in logic and argumentation): Related to beliefs or what people think is true. 'Doxastic' comes from the Greek word for 'opinion' and is used to describe theories that focus on people's beliefs rather than objective facts.
Epistemic: "Epistemic" relates to knowledge—how we know things, what counts as knowledge, and whether we can trust what we believe to be true. It comes from the Greek word for knowledge and is used to describe questions about the reliability and validity of our beliefs and understanding. For example, "epistemic humility" means acknowledging the limits of what you can actually know for certain.
Evidence(Distinguished from prior/intrinsic probability in the context of the low priors argument): Factors extrinsic to a hypothesis that raise or lower its probability
Self-defeating(describes how using fictional dialogue would contradict the goal of accurate portraiture): An action that works against its own purpose—like trying to stay dry by jumping in a pool.

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