The thousand injuries of fortunato i had borne as i best could, but when he ventured upon insult i vowed revenge. you, who so well know the nature of my soul, will not suppose, however, that i gave utterance to a threat. at length i would be avenged; this was a point definitely settled—but the very definitiveness with which it was resolved precluded the idea of risk. i must not only punish but punish with impunity. a wrong is unredressed when retribution overtakes its redresser. it is equally unredressed when the avenger fails to make himself felt as such to him who has done the wrong.

which of the following correctly describes the main purpose of the narrative in this paragraph?

establish characterization
establish irony
establish setting
establish resolution