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This position became less and less plausible as thinkers such as David Hume began studying the natural history of religion and suggested that the origins of religion lay not in reason but in emotions such as the fear of the unknown .
 person: David Hume
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: David Hume