blessing vs free grace

blessing

noun
  • Some kind of divine or supernatural aid, or reward. 

  • A pronouncement invoking divine aid. 

  • Good fortune. 

  • A modern pagan ceremony. 

  • The act of declaring or bestowing favor; approval. 

  • A group of unicorns. 

  • A prayer before a meal; grace. 

  • Something someone is glad of. 

free grace

noun
  • A concept of grace as a gift given freely by God, without regard to entitlement or merit. 

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