free grace vs redemption

free grace

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

redemption

noun
  • Salvation from sin. 

  • The act of redeeming or something redeemed. 

  • The recovery, for a fee, of a pawned article. 

  • Rescue upon payment of a ransom. 

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