Question: What disease did the person that said "I destroy my enemy when I make him my friend." have?
Answer(s):
answer: Strabismus
answer: Smallpox
answer: Marfan syndrome

SPARQL query:
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.048cz_5 . 
?c ns:medicine.notable_person_with_medical_condition.condition ?x .
}