If you are lucky enough to have lived in Paris as a young man, then wherever you go for the rest of your life, it stays with you, for Paris is a moveable feast.
His quote captures everything about Paris in just that one sentence, for indeed it is a movable feast for all the senses and as he says, if you are lucky enough to live in Paris as a young person (I was) then it remains with you, as a part of you, no matter where you are!
Another Hemingway quote that I love:
Il n’y a que deux endroits au monde où l’on puisse vivre heureux:  chez soi et à Paris.
(There are only two places in the world where we can live happy:  at home and in Paris.)
Though I often looked for one, I finally had to admit that there could be no cure for Paris.