aspiration vs fire in the belly

aspiration

noun
  • The act of aspiring or ardently desiring; an ardent wish or desire, chiefly after what is elevated or spiritual (with common adjunct adpositions being to and of). 

  • The action of aspirating. 

  • A burst of air that follows the release of some consonants. 

fire in the belly

noun
  • The emotional stamina and vigor, passion, or inner drive to achieve something, to take action, etc. 

How often have the words aspiration and fire in the belly occurred in a corpus of books? (source: Google Ngram Viewer )