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Such an idea is unacceptable to modern philosophers with physicalist orientations and their general skepticism of the concept of " self " as postulated by David Hume , who could never catch himself " not " doing , thinking or feeling anything .
 David Hume
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 David Hume