free grace vs witchery

free grace

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

witchery

noun
  • Allure, charm, magic. 

  • An act of witchcraft. 

  • Witchcraft. 

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