bethink vs have opinion

bethink

verb
  • To think of (something or somebody) or that (followed by clause); to remind oneself, to consider, to reflect upon. 

  • To meditate, ponder; to consider. 

  • To determine, resolve. 

have opinion

verb
  • to think; to have or hold as an opinion 

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