good quote

. . . an unsatisfied desire which is itself more desirable than any other satisfaction. I call it Joy, . . . and considered only in its quality, it might almost equally well be called a particular kind of unhappiness or grief. But then it is a kind we want. I doubt wether anyone who has tasted it would ever, if both were in his power, exchange it for all the pleasures of the world. But then Joy is never in our power and pleaure often is.

--C.S. Lewis, Surprised by Joy: The Shape of My Early Life