penitence vs self-flagellation

penitence

noun
  • The condition of being penitent; a feeling of regret or remorse for doing wrong or sinning. 

self-flagellation

noun
  • The practice of whipping oneself as penance for sins. 

  • Intense feelings of guilt. 

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