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JOHN F. MACARTHUR explains why accepting the mark of the beast: 666 wouldn't automatically condemn the person who receives it. As of 8.18.2014, John MacArthur's Grace To You website presently stands by their belief that people can receive the 666 mark, but repent for having received it afterwards.
March 25, 2014 - UPDATED ARTICLE BELOW
http://www.gty.org/resources/Blog/B131030