Which excerpt below best summarizes the theme of "The Cask of Amontillado"?

"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.""Against the new masonry I reerected the old rampart of bones. For the half of a century no mortal has disturbed them.""Come," I said, with decision, we will go back; your health is precious. You are rich, respected, admired, beloved; you are happy as once I was.""I broke and reached him a flagon of De Grave. He emptied it at a breath. His eyes flashed with a fierce light."