restraint vs stoicism

restraint

noun
  • something that restrains, ties, fastens or secures 

  • control or caution; reserve 

stoicism

noun
  • A school of philosophy popularized during the Roman Empire that emphasized reason as a means of understanding the natural state of things, or logos, and as a means of freeing oneself from emotional distress. 

  • A real or pretended indifference to pleasure or pain; insensibility; impassiveness. 

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