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This idea leads into the second moral justification of the Buddha : intentionally performing negative actions reinforces and propagates mental defilements which keep persons bound to the cycle of rebirth and interfere with the process of liberation , and hence intentionally performing good karmic actions is participating in mental purification which leads to nirvana , the highest happiness .
 person: Buddha
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: Buddha