good news vs lightheartedness

good news

noun
  • Something or someone pleasant, fortunate, or otherwise positive. 

  • The message of Jesus concerning the salvation of the faithful (as elaborated in the Gospels) 

lightheartedness

noun
  • An amusement or item of a pleasant but inconsequential nature. 

  • The state of being lighthearted, joyous, cheerful, without a care. 

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