encourage vs forbid

encourage

verb
  • To mentally support; to motivate, give courage, hope or spirit. 

  • To spur on, strongly recommend. 

  • To foster, give help or patronage 

forbid

verb
  • To oppose, hinder, or prevent, as if by an effectual command. 

  • To deny, exclude from, or warn off, by express command. 

  • To disallow; to proscribe. 

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