I imagined her behaving like that, at home perhaps, in the linen-room, with the young man whom I had seen escorting her along the Avenue des Champs-Élysées. And so, just as when, a little time back, I had believed myself to be calmly established in a state of happiness, it had been fatuous in me, now that I had abandoned all thought of happiness, to take for granted that at least I had grown and was going to remain calm. For, so long as our heart keeps enshrined with any permanence the image of another person, it is not only our happiness that may at any moment be destroyed; when that happiness has vanished, when we have suffered, and, later, when we have succeeded in lulling our sufferings to sleep, the thing then that is as elusive, as precarious as ever our happiness was is our calm. Mine returned to me in the end, for the cloud which, lowering our resistance, tempering our desires, has penetrated, in the train of a dream, the enclosure of our mind, is bound, in course of time, to dissolve, permanence and stability being assured to nothing in this world, not even to grief. Besides, those whose suffering is due to love are, as we say of certain invalids, their own physicians.