justification vs saving grace

justification

noun
  • The forgiveness of sin. 

  • A reason, explanation, or excuse which someone believes provides convincing, morally acceptable support for behavior or for a belief or occurrence. 

  • The alignment of text to the left margin (left justification), the right margin (right justification), or both margins (full justification). 

saving grace

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

  • A redeeming quality or factor. 

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