proverb vs quotation

proverb

noun
  • A familiar illustration; a subject of contemptuous reference. 

  • A striking or paradoxical assertion; an obscure saying; an enigma; a parable. 

  • A drama exemplifying a proverb. 

  • A phrase expressing a basic truth which may be applied to common situations. 

verb
  • To name in, or as, a proverb. 

  • To write or utter proverbs. 

  • To provide with a proverb. 

quotation

noun
  • A fragment of a human expression that is repeated by somebody else, for example from literature or a famous speech. 

  • A price that has been quoted for buying or selling. 

  • The act of setting a price. 

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