intercession vs state of grace

intercession

noun
  • A prayer to God on behalf of another person. 

  • The act of intervening or mediating between two parties. 

state of grace

noun
  • A condition free from mortal sin, in which one has the favor of God and enjoys unmerited divine assistance. 

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