The diction used appears to be simple and literal yet their true meanings may be left to reader interpretation, such as the fly the narrator sees. This could be a nod to the lord of the flies, aka the devil, which is usually associated with death and damnation. This adds to the story as the narrator is there sitting at their death bed wondering what awaits them in the afterlife, possibly the fly being a sign that they will be sentenced to the damned.
Dickinson uses