ardor vs calmness

ardor

noun
  • Great warmth of feeling; fervor; passion. 

  • Intense heat. 

  • Spirit; enthusiasm; passion. 

calmness

noun
  • The state of being calm; tranquillity; silence. 

  • The product of being calm. 

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