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That they chose to do so was not inevitable , for they could have followed the example adopted by prominent esotericists active at the time like Helena Blavatsky who had chosen to use the term and concept of magic in a positive sense .
 Helena Blavatsky
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:
 Helena Blavatsky