modesty vs self-confidence

modesty

noun
  • The quality of being modest; having a limited and not overly high opinion of oneself and one's abilities. 

  • Moderate behaviour; reserve. 

  • Pudency, avoidance of sexual explicitness. 

self-confidence

noun
  • The state of being self-confident 

  • A measure of one's belief in one's own abilities 

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