on the square vs sincere

on the square

prep
  • A discreet, unassuming reference to freemasonry. 

  • Honest and open. 

sincere

adj
  • Genuine; meaning what one says or does; heartfelt. 

  • Meant truly or earnestly. 

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