| Consider some arbitrary machine M:
 Either: M is consistent,
 
 In which case, by Gödelâs theorem there will be a sentence that humans recognise as true but that M can't prove. So, we can do something that machine M can't.
 
 Or, M is not consistent
 
 In which case, M can't be a mind because minds must be consistent systems.
 
 In either case, the machine can't be a mind.
 
 John Lucas (1961).
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