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Joseph Campbell interprets the myth as being about the psychological power of a descent into the unconscious , the realization of one 's own strength through an episode of seeming powerlessness , and the acceptance of one 's own negative qualities .
 Joseph Campbell
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:
 Joseph Campbell