Books are almost as individual as friends. There is no earthly use in laying down general laws about them. Some meet the needs of one person, and some of another…. I am speaking of books that are meant to be read. Personally, granted that these books are decent and healthy, the one test to which I demand that they all submit is that of being interesting…. Personally the books by which I have profited infinitely more than by any others have been those in which profit was a by-product of the pleasure; that is, I read them because I enjoyed them, because I liked reading them, and the profit came in as part of the enjoyment.
—Theodore Roosevelt, An Autobiography