2015
. The difference between successful people and very successful people is that very successful people say ‘ no’ to almost everything . - Warren Buffett Great quotations , learn fast , free app : {{USERNAME}} # Wisdom # Inspiration # Motivation .
 Warren Buffett
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: group, creative work, person, event, product, location, corporation 
Text: {0} 
Answer:
 Warren Buffett