penance vs requital

penance

noun
  • A voluntary self-imposed punishment for a sinful act or wrongdoing. It may be intended to serve as reparation for the act. 

  • Any instrument of self-punishment. 

  • A sacrament in some Christian churches. 

verb
  • To impose penance; to punish. 

requital

noun
  • Retaliation or reprisal; vengeance. 

  • Compensation for loss or damage; amends. 

  • Repayment, reward, recompense, return in kind. 

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