mystery vs revelation

mystery

noun
  • Something secret or unexplainable; an unknown. 

  • Someone or something with an obscure or puzzling nature. 

  • A religious truth not understandable by the application of human reason alone (without divine aid). 

  • A particular event or series of events in the life of Christ. 

  • A sacrament. 

  • A secret religious celebration, admission to which was usually through initiation. 

  • A craft, art or trade; specifically a guild of craftsmen. 

revelation

noun
  • Something that is revealed. 

  • Something that turns out to be a great success. 

  • Something dramatically disclosed. 

  • A manifestation of divine truth. 

  • The act of revealing or disclosing. 

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