indulge vs refrain

indulge

verb
  • To give way to (a habit or temptation); to not oppose or restrain. 

  • To grant an extension to the deadline of a payment. 

  • To satisfy the wishes or whims of. 

  • To grant as by favour; to bestow in concession, or in compliance with a wish or request. 

  • To yield to a temptation or desire. 

refrain

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

noun
  • The chorus or burden of a song repeated at the end of each verse or stanza. 

  • A much repeated comment, complaint, or saying. 

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