blab vs talk to oneself

blab

verb
  • To tell tales; to gossip without reserve or discretion. 

  • to speak carelessly or excessively 

noun
  • One who blabs; a babbler; a telltale; a gossip or gossiper. 

  • Gossip; prattle. 

talk to oneself

verb
  • To say one's thoughts aloud, particularly while also not conversing with anyone else. 

How often have the words blab and talk to oneself occurred in a corpus of books? (source: Google Ngram Viewer )