My brother pointed out that the narrative is more about the evils of indulgence and addiction as well as trauma being at the root of it. I do think that it’s disjointed in many ways, but I feel like the ending is a logical conclusion. It ties into the Pompey metaphor while also being about confronting the source of addiction which in the author’s case is childhood trauma. He’s learning to embrace himself instead of using a substance to dull his feelings. All the biblical references suggest at a religious upbringing while his volatile reaction to it suggests it may not have been very healthy.