Requiring certainty about the absence of deceptive impressions before assenting generates an infinite regress, as each meta-level check is itself an impression subject to the same standard.

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Deceptive impressions(in discussions about what we can trust): Thoughts, perceptions, or beliefs that seem true but are actually false or misleading.
Meta-level(as used in logic and philosophy of language): A higher level of thinking where you analyze or talk about something itself, rather than using it directly—like discussing grammar rules rather than just speaking.
assent(Epictetan epistemology and action theory): The cognitive act of accepting a proposition as true, regulated by perceived logical consistency or contradiction with one's existing beliefs.
epistemology(Contrasted with purely descriptive scientific inquiry): A normative enterprise that tells us how we ought to reason from evidence and how we ought to justify our beliefs, as distinct from merely describing how we do reason or justify beliefs

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