I always was more under the impression that it is about destiny, the force of being restless, feeling the tide coming and going inside yourself, same as in Go, Love. The prayer level seems to illustrate that destiny part. It's just something you cannot do anything against it. Maybe the spirits refer to the ancestors who always were on the run. Also Marbletown with the homeless Hobo guy comes to mind. In my interpretation, that was always an allegory for Jewish people.
LE