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Ideas for 'Parmenides', 'A Priori Knowledge Revisited' and 'Meno'

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13. Knowledge Criteria / A. Justification Problems / 1. Justification / b. Need for justification
As a guide to action, true opinion is as good as knowledge [Plato]
     Full Idea: True opinion is as good a guide as knowledge for the purpose of acting rightly.
     From: Plato (Meno [c.385 BCE], 97b)
     A reaction: This is the germ of Peirce's epistemology - that knowledge is an interesting theoretical concept, but opinion/belief is what matters, and most needs explanation.