inspire vs light a fire under

inspire

verb
  • To infuse into; to affect, as with a superior or supernatural influence; to fill with what animates, enlivens or exalts; to communicate inspiration to. 

  • To infuse into the mind; to communicate to the spirit; to convey, as by a divine or supernatural influence; to disclose preternaturally; to produce in, as by inspiration. 

  • To draw in by the operation of breathing; to inhale. 

  • To infuse by breathing, or as if by breathing. 

  • To spread rumour indirectly. 

light a fire under

verb
  • To motivate or encourage (someone) to start sooner or move faster. 

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