What does the narrator mean when he says, "It is equally unredressed when the avenger fails to make himself felt as such to him who has done the wrong"? I think the first sentence ("A wrong is undressed when retribution overtakes its redresser") says that a wrong is undone once the avenger gets revenge? Does the second part mean that a wrong can also be undone if the avenger feels guilty about what he did to get revenge?
In the first paragraph of Edgar Allan Poe's “The Cask of Amontillado,” Montresor asserts that he will plan his revenge against Fortunato carefully so that he does not get caught and punished but also so that Fortunato knows exactly who is taking revenge upon him and why. Only then will revenge be sweet in Montresor's eyes.