instigate vs take heart

instigate

verb
  • to goad or urge (a person) forward, especially to wicked actions; to provoke 

  • to incite; to bring about by urging or encouraging 

take heart

verb
  • To be courageous; to regain one's courage. 

intj
  • Used when encouraging someone to bear or take up a difficult situation. 

How often have the words instigate and take heart occurred in a corpus of books? (source: Google Ngram Viewer )