ataraxia vs gratification

ataraxia

noun
  • Tranquility of mind; absence of mental disturbance. 

gratification

noun
  • A feeling of pleasure; satisfaction. 

  • The act of gratifying or pleasing, either the mind, or the appetite or taste. 

  • A gratuity; a reward. 

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