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Some philosophers , such as Sartre , believe in an epistemic loneliness in which loneliness is a fundamental part of the human condition because of the paradox between people 's consciousness desiring meaning in life and the isolation and nothingness of the universe .
 Sartre
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sartre