machine_question: what was the first book the person that said "A loving heart is the truest wisdom." wrote
question: Name the first book written by the person who said "A loving heart is the truest wisdom".?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ?c)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ?c ns:people.person.quotations ns:m.048jd25 . 
  ?c ns:book.author.works_written ?x .
  ?x ns:common.topic.notable_types ns:m.01xryvm .
  ?x ns:book.written_work.copyright_date ?sk0 .
  }
  ORDER BY xsd:datetime(?sk0)
  LIMIT 1
  
webqsp_question: what was the first book charles dickens wrote