For him, then, clearly reading was fundamental, as something to learn by as well as to kill time. And there's no evidence -- none -- that he was reading just to get free personal pan pizzas. But had he been reading to earn pizzas, he would have earned a great many, and subsequently been a very fat man.
But it'd be weird back then to be a big reader, because books weren't really that plentiful, or they were expensive to get. And being out in the sticks somewhere, they just didn't have them. So we have it so great and don't appreciate it.
According to a book I've been reading today, Herndon's Life of Lincoln, Lincoln concentrated on the Bible, Aesop's Fables, Robinson Crusoe, Pilgrim's Progress, a History of the United States, and Weems' Life of Washington. (p. 74). And as to this Life of Washington, he borrowed it from a guy, but then they had cracks in their log cabin and it got water damaged when it rained and Lincoln had to work hard to pay the guy back 75 cents. The guy was very unforgiving (p. 74-75).
Lincoln didn't get much formal schooling. All total it was only about a year. But he educated himself by carrying books around and reading all the time he could. And he had a great memory of the things he read.
One friend Lincoln had, a younger boy -- Joseph C. Richardson -- reported that Lincoln had the best penmanship in their neighborhood. At Richardson's request, Lincoln wrote him a penmanship sample that touched on his love for books. (p. 75-76)
It said:
"Good boys who to their books apply(The book quotes are from "Herndon's Life of Lincoln," 1965 paperback in the Fawcett World Library.)
Will all be great men by and by."