“Desire, therefore, can be useful to the man of letters, first by keeping him at a distance from other men and from resembling them, then by restoring some movement to a spiritual machine which otherwise, beyond a certain age, tends to seize up. None of this makes us happy, but we can examine the reasons that keep us from being so, reasons which would have remained hidden from us if not for these sudden irruptions of disappointment. And dreams cannot be made real, we know that; still, perhaps we would not form any without desire, and it is useful to have dreams so that we can see their collapse and learn from it.”

(Proust, The Prisoner, trans. Carol Clark, p. 166.)