Letters 55.8

The place where one lives, however, can contribute little towards tranquillity; it is the mind which must make everything agreeable to itself. I have seen men despondent in a gay and lovely villa, and I have seen them to all appearance full of business in the midst of a solitude. For this reason you should not refuse to believe that your life is well-placed merely because you are not now in Campania. But why are you not there? Just let your thoughts travel, even to this place.

Seneca, Letters to Lucilius 55.8, translated by Richard Mott Gummere