agitation vs self-possession

agitation

noun
  • A disturbance of personal tranquillity; disturbance of someone's peace of mind. 

  • Excitement of public feeling by discussion, appeals, etc. 

  • The act of agitating, or the state of being agitated; the state of being disrupted with violence, or with irregular action; commotion. 

self-possession

noun
  • calmness and composure, especially when under stress 

  • confidence in one's own powers 

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