continence vs unselfishness

continence

noun
  • Uninterrupted course; continuity. 

  • The voluntary control of urination and defecation. 

  • Moderation or self-restraint, especially in sexual activity; abstinence. 

unselfishness

noun
  • The state of being unselfish. 

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