From Some Can Whistle by Larry McMurty:
The rules of happiness are as strict as the rules of sorrow;
Indeed, perhaps more strict. The two states have different densities.
I've come to think.
The lives of happy people are dense with their own doings -
Crowded, active, thick - urban,
I would almost say.
But the sorrowing are nomads, on a plain with few landmarks
And no boundaries; sorrows horizons are vague and
Its demands few.
Jeanie and I had not become strangers;
It was just that she lived in the city and
I lived on the plain.