Edmund Gettier Archives

More Generally: Contemporary Thinkers (160)

September 21, 2008

Quote of the Day: Plato on Opinion and Knowledge

Following up on the last post, I thought it would be helpful to go back to Plato to provide another view on the subject. Socrates and Meno are discussing the nature of virtue, whether it is a form of knowledge, and whether it can be taught: SOCRATES: So true opinion is in no way a worse guide to correct action than knowledge. It is this that we omitted in our investigation of the nature of virtue, when we said that only knowledge can lead to correct action, for true opinion can do so also. ... MENO: That appears to be...
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Is Deduction Justification-Preserving?

There is a popular class of theories of epistemology called "Justified True Belief" (JTB) theories. According to these theories (which have their ancestor in Plato) a belief counts as knowledge just in case the content of the belief is true and the belief itself is justified. ... The reason I call this a class of theories, rather than a single theory, is that no one can agree on what 'justification' is other than to say that it is that property which, when added to truth, makes a belief knowledge. The Gettier cases are a famous pair of objections to JTB accounts. Many more cases have been added since the original publication in 1963. Now, both of the original Gettier cases and, as far as I know, all of the more recent ones, involve a type of deduction called a vacuous introduction...
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