self-control vs self-mastery

self-control

noun

  • The ability to control one's desires and impulses; willpower. 

verb

  • To control oneself or itself. 

self-mastery

noun

  • The conscious control of one's behaviour; self-command. 

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