I'm a Polish student and I'm just finishing writing my diploma paper. My topic is strictly connected with Edgar Allan Poe and I've got a little problem with his two quotes. I mean, I want to use these quotes:

"Science has not yet taught us if madness is or is not the sublimity of the intelligence"

"And have I not told you that what you mistake for madness is but an over acuteness of senses?"

Unfortunately, I don't know where these quotes come from. And as you know, I have to write the references.

So, my question is, does anybody know a book, article, whatever, where these 2 quotes, or at least one of them, were used?

Please help me