blood, sweat and tears vs diligence

blood, sweat and tears

noun
  • A person's determination and hard work. 

diligence

noun
  • The qualities of a hard worker, including conscientiousness, determination, and perseverance. 

  • The process by which persons, lands, or effects are seized for debt; process for enforcing the attendance of witnesses or the production of writings. 

  • A public stage-coach. 

  • Steady application; industry; careful work involving long-term effort. 

  • Carefulness. 

How often have the words blood, sweat and tears and diligence occurred in a corpus of books? (source: Google Ngram Viewer )