If you are in Gyaros, do not let your mind dwell upon life in Rome, and all the pleasures it offered to you when living there, and all that would attend your return. Rather, be intent on this—how he that lives in Gyaros may live in Gyaros like a man of spirit. And if you are in Rome, do not let your mind dwell upon life in Athens, but study only how to live in Rome.
Finally, in the room of all other pleasures put this—the pleasure which springs from conscious acquiescence to God.
— Epictetus (Public domain)
(Gyaros is a small, desolate island in the Aegean Sea which served as a place of exile in the early Roman Empire.)