Slide 1
Testimony carries information we did not observe ourselves
Testimony means learning from what others tell us. It connects a listener to information the listener has not independently observed.
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A traveller asking a station employee for a platform illustrates the dependence. Rechecking every fact from scratch would defeat much of the practical value of communication and shared inquiry.
Slide 2
An honest speaker can still lack the right knowledge
A speaker's competence and sincerity are different matters. Someone can report honestly while lacking relevant knowledge, or know the facts while misleading a listener.
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In the station example, a helpful visitor may repeat an outdated platform number. A reliable guide must have access to the relevant information as well as a reason to communicate it accurately.
Slide 3
Must trust begin with evidence of reliability?
Philosophers debate whether learning from testimony requires independent evidence that the speaker is reliable. Others allow some trust unless there is a reason to doubt it.
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These positions differ about the listener's initial entitlement, not merely about whether lying occurs. Both must explain what happens when warning signs appear, such as a clear conflict with a current departure board.
Slide 4
New reasons for doubt can weaken justification
A defeater is information that undermines an apparent justification. Testimonial confidence should respond to relevant reasons for doubt.
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Hearing that a route has been diverted does not prove every employee mistaken. It does provide a reason to ask whether the particular platform report was updated. The challenge can be local rather than global.
Slide 5
Shared knowledge needs ways to discover and correct mistakes
Testimony makes expertise and cooperation possible. Its philosophical importance lies in explaining justified dependence, not in demanding impossible independence.
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Records, correction channels and identifiable responsibility can help a community discover mistakes. These arrangements add opportunities for checking that a single isolated conversation may lack, while still relying on other people’s contributions.
Sources
- Epistemological Problems of Testimony
Stanford Encyclopedia of Philosophy