“I will underline the quality common to the three experiences; it is that of an unsatisfied desire, which is itself more desirable than any other satisfaction. I call it Joy, which is here a technical term and must be sharply distinguished both from Happiness and from Pleasure. Joy (in my sense) has indeed one characteristic, and one only, in common with them; the fact that anyone who has experienced it will want it again. Apart from that, 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 whether anyone who has tasted it would ever exchange it for all the pleasures in the world. But then, Joy is never in our power, and pleasure often is.”
— C. S. Lewis, Surprised by Joy