In worrying that writing would enfeeble memory, Socrates was, as the Italian novelist and scholar Umberto Eco says, expressing “an eternal fear: the fear that a new technological achievement could abolish or destroy something that we consider precious, fruitful, something that represents for us a value in itself, and a deeply spiritual one.” The fear in this case turned out to be misplaced. Books provide a supplement to memory, but they also, as Eco puts it, “challenge and improve memory; they do not narcotize it.”