In this paper I investigate the nature of the concept knowledge. I ask how this concept must be if it is to generate conceptual truths about knowledge, arguing that it must have a set of principles attached to it (a folk theory) that plays a reference‐determining role. I then produce evidence that suggests that the folk theory attached to our concept KNOWLEDGE—our folk epistemology—is inconsistent. If folk epistemology is inconsistent, I conclude, then either there are no conceptual truths about knowledge or any conceptual truths there are will not be a priori knowable.
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