how+calmly+I+can+tell+you+the+whole+story.

Hearken! and observe how healthily --how calmly I can tell you the whole story The Tell-Tale Heart

The narrator claims to tell the story calmly, but as the story progresses, it is obvious that he is becoming less and less calm. He eventually goes completely mad aat the end, both in the story and narriting it. This is another example of the narrator claiming not to be mad and eventually contradicts himself in the end.

I think that Edgar Allan Poe did this to keep the reader on the edge of their seat and to shock them with the end.

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