Answer:
In my opinion, the author chose to present the story in this way because Salva, who has already lived in similar circumstances is going to change Nya's life.
Explanation
We suspect that the speaker doesn't mean literal days here, but rather his time on earth—his life. The glue, or rope, between these days is "natural piety." ... We think the speaker wants his days to be tied together by reverence and piety toward the natural world, rather than toward religion.
