mean to say vs speak of

mean to say

verb
  • To imply or intend to convey with one's words; used to correct or clarify one's previous utterance, or to seek such clarification. 

speak of

verb
  • To bespeak; show; indicate; foretell; suggest. 

How often have the words mean to say and speak of occurred in a corpus of books? (source: Google Ngram Viewer )