How do Montresor´s words and actions advance the theme of the story

This question is about "The Cask of Amontillado"

Montressor's words and actions show how corrupt revenge is.

Explanation:

Montressor's words and actions show that he is bordering on insanity and madness. That's because he planned a torturous revenge for an enemy of his and tells the story of that vigilance with a tone of victory and joy, for having managed to carry out his sick plans. This shows how revenge has a highly corruptive nature, allowing the person who exercised the revenge to lose parts of himself, showing madness and folly, like Montressor.

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