Walt Whitman, Democratic Vistas (1871):

A new theory of literary composition for imaginative works of the very first class, and especially for highest poems, is the sole course open to these States. Books are to be call’d for, and supplied, on the assumption that the process of reading is not a half sleep, but, in highest sense, an exercise, a gymnast’s struggle; that the reader is to do something for himself, must be on the alert, must himself or herself construct indeed the poem, argument, history, metaphysical essay — the text furnishing the hints, the clue, the start or frame-work. Not the book needs so much to be the complete thing, but the reader of the book does. That were to make a nation of supple and athletic minds, well-train’d, intuitive, used to depend on themselves, and not on a few coteries of writers. 

A recommendation more important now than ever.