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The philosophy of testimony (also, epistemology of testimony) considers the nature of language and knowledge's confluence, which occurs when beliefs are transferred between speakers and hearers through testimony. Testimony constitutes words, gestures, or utterances that convey beliefs. This definition may be distinguished from the legal notion of testimony in that the speaker does not have to make a declaration of the truth of the facts.

The role of testimony in acquiring belief and knowledge has been a relatively neglected philosophical issue. CAJ (Tony) Coady believes that this is because traditional epistemology has had a distinctly individualist flavour.

However, it seems that many of the beliefs that we hold have been gained through accepting testimony. For example, one may only know that Kent is a county of England or that David Beckham earns $30 million per year because one has learned these things from other people. A more striking example is the belief about one's own birthdate. If you know your birthdate, the evidence for your belief was almost certainly received through testimony.

One of the problems with acquiring knowledge through testimony is that it does not seem to live up to the standards of knowledge (see justification of knowledge in philosophy ). As Owens notes, it does not seem to live up to the Enlightenment ideal of rationality captured in the motto of the Royal Society – ‘Nullius in verba (Into the word of no one)’. The Royal Society interprets this as "take nobody's word for it." Crudely put, the question is: 'How can testimony give us knowledge when we have no reasons of our own?'

Coady suggests that there are two approaches to this problem:

Reductivism, which seeks to ‘reduce’ or re-describe our behaviour such that it is not at odds with the traditional view of knowledge

and

Anti-reductivism, which seeks to fit our behaviour in with a different concept of knowledge. For example, we may compare it to an account of how perception gives us knowledge or how memory gives us knowledge directly.

Hume is one of the few early philosophers to offer anything like a sustained account of testimony, this can be found in his ‘An Enquiry Concerning Human Understanding’ in the section on miracles. The basic idea is that our justification for believing what people tell us comes from our experience of the ‘...constant and regular conjunction’ between the state of affairs as people describe it and the actual state of affairs (i.e. our observation that they match). On Coady's schema he is a reductivist.

Coady offers an anti-reductivist account of testimony. He claims that testimony is like perception, we don't have to have reasons for believing it, only an absence of reasons not to believe it. On Coady's account we are justified in being credulous. Proponents of anti-reductivism in the history of philosophy include Augustine of Hippo and Thomas Reid.

Perhaps also significant is that Bertrand Russell argued that knowledge by acquaintance played an important part in epistemology.

Notes

Fricker, Elizabeth; Cooper, David E. (1987). "The Epistemology of Testimony". Proceedings of the Aristotelian Society, Supplementary Volumes. 61: 57–106. doi:10.1093/aristoteliansupp/61.1.57. ISSN 0309-7013. JSTOR 4106834.
Lackey, Jennifer (18 March 2010). Learning from words : testimony as a source of knowledge. Oxford University Press. p. 25. ISBN 978-0-19-957561-9. OCLC 907775787.
Coady, 1992
Owens, 2000, p. 163
Hume, 1993, p. 74

References

Coady, C.A.J. (1992), ‘Testimony; A Philosophical Study’, Clarendon Press, Oxford. ISBN 0-19-823551-8
Gelfert, A. (2014), ‘A Critical Introduction to Testimony’, Bloomsbury Academic, London. ISBN 9781441193506
Owens, D. (2000), ‘Reason without Freedom: The Problem of Epistemic Normativity’, Routledge, London. ISBN 0-415-22389-X
Shieber, J. (2015), "Testimony: A Philosophical Introduction", Routledge, London. ISBN 978-0415821322
Hume, D. (1748), ‘An Enquiry Concerning Human Understanding’, Hackett Publishing Company, Cambridge. ISBN 0-915144-16-6

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Further reading