The Greek word for "return" is nostos. Algos means "suffering." So nostalgia is the suffering caused by an unappeased yearning to return.
Anyone whose goal is 'something higher' must expect someday to suffer vertigo.
How could she feel nostalgia when he was right in front of her? How can you suffer from the absence of a person who is present? You can suffer nostalgia in the presence of the beloved if you glimpse a future where the beloved is no more.
I am not worthy of my suffering. A great sentence. It suggests not only that suffering is the basis of the self, its sole indubitable ontological proof, but also that it is the one feeling most worthy of respect; the value of all values.