"A moth was a caterpillar, once, but it no longer is a caterpillar. It cannot break itself back down, cannot metamorphose in reverse. To try to eat leaves again would mean starvation. Crawling back into the husk would provide no shelter. It is a paradox – the impossibility of reclaiming that which lies behind, housed within a form comprised entirely of the repurposed pieces of that same past. We exist where we begin, yet to remain there is death."

I really loved this. It was limited by its scope, and I'd have read every page of a story double its length.