“If we take literature in the widest sense, so as to include the literature both of knowledge and of power, the question, ‘What is the good of reading what anyone writes?’ is very like the question ‘What is the good of listening to what anyone says?’
Unless you contain in yourself sources that can supply all the information, entertainment, advice, rebuke and merriment you want, the answer is obvious.
And if it is worthwhile listening or reading at all, it is often worth doing so attentively.
Indeed we must attend even to discover that something is not worth attention.”
–C.S. Lewis, An Experiment in Criticism (Cambridge: Cambridge University Press, 1961/1992), 131-132.