知識とことば : 『テアイテトス』第一部後半(160d5-187a8)の一解釈

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  • Knowledgeand language : an interpretation of Plato's theaetetus 160d5-187a8
  • チシキ ト コトバ テアイテトス ダイ1ブ コウハン 160d5 187a8 ノ イチ カイシャク

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In the first part of Theaetetus (151d7.187a8), Theaetetus tries to define knowledge as perception. In the first half of this part (151d7.160d4), Plato explains the interrelation between this definition and the two theses, which are 'Man is the measure of all things', and 'All things really are in a process of becoming as the result of movement and change'. And Plato argues that these two are based on the thesis 'Nothing is one thing just by itself'. In the second half of the first part, Plato provides 9 arguments against the definition and two theses severally, so the definition is refuted. This paper attempts to clarify the structure of the 9 arguments, in addition to identifying the Plato's aim in refuting the definition. In my view of this paper, Plato argues that knowledge cannot be based on the thesis 'Nothing is one thing just by itself', because our use of language is in direct conflict with this thesis.

In the first part of Theaetetus (151d7.187a8), Theaetetus tries to define knowledge as perception. In the first half of this part (151d7.160d4), Plato explains the interrelation between this definition and the two theses, which are 'Man is the measure of all things', and 'All things really are in a process of becoming as the result of movement and change'. And Plato argues that these two are based on the thesis 'Nothing is one thing just by itself'. In the second half of the first part, Plato provides 9 arguments against the definition and two theses severally, so the definition is refuted. This paper attempts to clarify the structure of the 9 arguments, in addition to identifying the Plato's aim in refuting the definition. In my view of this paper, Plato argues that knowledge cannot be based on the thesis 'Nothing is one thing just by itself', because our use of language is in direct conflict with this thesis.

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