recommendation vs saving grace

recommendation

noun
  • A commendation or endorsement. 

  • An act of recommending. 

  • A suggestion or proposal about the best course of action (with adpositions including "about" for the context and "to" for the course of action) 

  • That which is recommended. 

saving grace

noun
  • A redeeming quality or factor. 

  • God's grace or blessing, enabling sinners to attain salvation. 

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