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In certain situations, lies can be used to pass on knowledge. The kinds of cases I focus on are those involving a speaker's devious manipulation of the hearer's irrational or prejudiced thought. These cases show that sometimes a speaker's knowledge of a hearer's mind is necessary for the testimonial transmission of knowledge. They also support a 'seeding' model of knowledge transmission, rather than one that is akin to the postal delivery of complete parcels of information.
One kind of successful communication involves the transmission of knowledge from speaker to hearer. Such testimonial knowledge transmission is usually seen as conforming to three widely held epistemological approaches: reliabilism, impartialism and evidentialism. First, a speaker must
be a reliable testifier in order that she transmits knowledge, and reliability is cashed out in terms of her likelihood of speaking the truth. Second, if a certain speaker's testimony has sufficient epistemic weight to be believed by hearer1, then it should also be believed by hearer2. Third,
the normative constraint here is evidentially grounded: whether or not a hearer should believe a speaker depends on the evidence the hearer has that the speaker is telling the truth. I argue that there are cases of testimonial knowledge transmission that are incompatible with these three claims.
This is when one accepts the testimony of an intimate friend.
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