generosity vs self-interest

generosity

noun
  • A generous act. 

  • The trait of being abundant, more than adequate. 

  • The trait of being willing to donate money, time or resources. 

self-interest

noun
  • One's personal interest or advantage, especially when pursued without regard for others. 

How often have the words generosity and self-interest occurred in a corpus of books? (source: Google Ngram Viewer )