glimpse vs leap to mind

glimpse

verb
  • To appear by glimpses. 

  • To see or view briefly or incompletely. 

noun
  • A brief look, glance, or peek. 

  • A sudden flash. 

  • A faint idea; an inkling. 

leap to mind

verb
  • To appear suddenly in one's thoughts. 

How often have the words glimpse and leap to mind occurred in a corpus of books? (source: Google Ngram Viewer )