Montresor describe Fortunato's strengths and weaknesses early in the story as:
In the book “The Cask of Amontillado” by Edgar Allan Poe the book tells a story centered around a betrayal and revenge.
Note that it tells how Montresor uses weakness to rightly trap Fortunato as he uses it to lure Him.
Hence, Montresor states that Fortunato is vain in nature and not open enough to see that Montresor was his enemy all along.
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