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Criticizing Kant 's theory of knowledge exposed in the " Critique of Pure Reason " and his conception of truth – which he compares to Plato 's conception of truth as its symmetrical inversion ( order of nature / order of thought ) – Bergson attempted to redefine the relations between science and metaphysics , intelligence and intuition , and insisted on the necessity of increasing thought 's possibility through the use of intuition , which , according to him , alone approached a knowledge of the absolute and of real life , understood as pure duration .
 Kant, Plato, Bergson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kant, Plato, Bergson