encourage vs prohibit

encourage

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

  • To spur on, strongly recommend. 

  • To foster, give help or patronage 

prohibit

verb
  • To forbid, disallow, or proscribe officially; to make illegal or illicit. 

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