altruism vs self-seeking

altruism

noun
  • Action or behaviour that benefits another or others at some cost to the performer. 

  • Regard for others, both natural and moral without regard for oneself; devotion to the interests of others; brotherly kindness. 

self-seeking

adj
  • Mindful of, or promoting, only one's own interests. 

  • That searches for a target automatically. 

noun
  • The selfish promotion of one's own interests. 

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