Books We Read More Than Once

Why do we read the books we do? And when we read a book more than once, why is that? Having just finished Colin Woodward's 'The Republic of Pirates' for the second time in less than a year, and now closing in on a third read-through of Charles C. Mann's '1491: New Revelations of the Americas Before Columbus,' I am trying to figure out what the common denominator is for me. Then I consider this piece at CNBC from January 2019 stating '24 percent of American adults haven’t read a book in the past year' - and I am baffled that anyone can help reading at least one book in the course of a year, much less stopping at one. If you read some books regularly or routinely, why do you go back to the books you go back to?  But if you do not read books at all, then you should. Fix that. Amend that. Add regular reading of good books to your routine. A mind is a terrible thing to waste, after all.