Question: What Steinbeck's mentor authored this line:  "I believe that man will not merely endure; he will prevail."?
Answer(s):
answer: William Faulkner

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.04107)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.04107 ns:influence.influence_node.influenced_by ?x .
?x ns:people.person.quotations ns:m.048cmx5 . 
}