Edgar Allan Poe's short story "The Tell-Tale Heart" is a glimpse inside the mind of a murderer as he recounts the tale of his hideous deed. The narrator is telling this tale and attempting to prove to the audience that he is not "mad". He asks the reader to see "how healthily - how calmly [he] can tell you the whole story". He also says that insane people know nothing and have no wits about them. These quotes are an attempt to show to the reader how clever he was in his preparation to his deed. This he feels is sufficient to prove his sanity. He does not realize that these actions, taking an hour to place his head inside the door, show his madness, not his sanity.