A fragment comes and lingers from an old Christian hymn, "You've got to cross that lonesome valley." It carries him forward. "You've got to cross it by yourself." It seems a Western hymn that belongs out in Montana.
"No one else can cross it for you," it says. It seems to suggest something beyond. "You've got to cross it by yourself."
He crosses a lonesome valley, out of the mythos, and emerges as if from a dream, seeing that his whole consciousness, the mythos, has been a dream and no one's dream but his own, a dream he must now sustain of his own efforts. Then even "he" disappears and only the dream of himself remains with himself in it.

Ch. 30 - Zen and the Art of Motorcycle Maintenance (1974)