Mention650201

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so:text There are all kinds of sources of our knowledge; but none has authority ... The fundamental mistake made by the philosophical theory of the ultimate sources of our knowledge is that it does not distinguish clearly enough between questions of origin and questions of validity. (en)
so:isPartOf https://en.wikiquote.org/wiki/Karl_Popper
so:description Conjectures and Refutations: The Growth of Scientific Knowledge (1963) (en)
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