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Despite believing in gods , Lucretius , like Epicurus , felt that religion was born of fear and ignorance , and that understanding the natural world would free people of its shackles .
 Lucretius, Epicurus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lucretius, Epicurus