Longing.

I am almost inclined to set it up as a canon that a children's story which is enjoyed only by children is a bad children's story ... In a sense a child does not long for fairy land as a boy longs to be the hero of the first eleven. Does anyone suppose that he really and prosaically longs for all the dangers and discomforts of a fairy tale?—really wants dragons in contemporary England? It is not so. It would be much truer to say that fairy land arouses a longing for he knows not what. It stirs and troubles him (to his life-long enrichment) with the dim sense of something beyond his reach and, Tar from dulling or emptying the actual world, gives it a new dimension of depth. He does not despise real woods because he has read of enchanted woods: the reading makes all real woods a little enchanted. This is a special kind of longing. The boy reading the school story of the type I have in mind desires success and is unhappy (once the book is over) because he can’t get it: the boy reading the fairy tale desires and is happy in the very fact of desiring.  

C.S. Lewis, from "On Three Ways of Writing for Children"

Some books that made me a reader and are as enchanting today as they were fifty years ago ...