An unliterary man may be defined as one who reads books once only...
The re-reader is looking not for actual surprises (which can come only once) but for a certain surprisingness... It is the quality of unexpectedness, not the fact that delights us. It is even better the second time...in literature. we do not enjoy a story fully at the first reading. Not till the curiosity, the sheer narrative lust, has been given its sop and laid asleep, are we at leisure to savour the real beauties. Til then, it is like wasting great wine on a ravenous natural thirst which merely wants cold wetness. The children understand this well when they ask for the same story over and over again, and in the same words. They want to have again the "surprise" of discovering that what seemed Little-Red-Riding-Hood's grandmother is really the wolf. It is better when you know it is coming: free from the shock of actual surprise you can attend better to the intrinsic surprisingness of the peripeteia*.
C.S. Lewis, Of Other Worlds: Essays and Stories, "On Stories" (1947)
* peripeteia: A sudden change of events or reversal of circumstances, especially in a literary work.