discourage vs fan the flames

discourage

verb
  • To extinguish the courage of; to dishearten; to depress the spirits of; to deprive of confidence; to deject. 

  • To persuade somebody not to do (something). 

noun
  • Lack of courage 

fan the flames

verb
  • To intensify or worsen an already difficult situation. 

How often have the words discourage and fan the flames occurred in a corpus of books? (source: Google Ngram Viewer )