I incline to Cain’s heresy,’ he used to say quaintly: ‘I let my brother go to the devil in his own way.’ Is an example of which literary device?

This is a tricky one hold pn let me get back to this one.

"it's more of an essay than story, but perhaps it is best described as a mood-piece: it uses a lot of musical imagery, not to mention sea imagery, religious imagery, and any other imagery that suits his purpose."