According to the context, the narrator avouches that:

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Q1290169 Inglês
     True! -- nervous -- very, very dreadfully nervous I had been and am; but why will you say that I am mad? The disease had sharpened my senses --not destroyed --not dulled them. Above all was the sense of hearing acute. I heard all things in the heaven and in the earth. I heard many things in hell. How, then, am I mad? Hearken! and observe how healthily --how calmly I can tell you the whole story. (By Edgar Allan Poe - Published 1843) 
According to the context, the narrator avouches that:
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