How we cite our quotes: (Paragraph)
Quote #4
"Then," I said, "you have been making a miscalculation, and the letter is not upon the premises, as you suppose." (68)
Dupin has a pretty black-and-white version of reality: either something is one way, or it must be another way. And we have to say, this works out well for him.
Quote #5
"So, as I knew he would feel some curiosity in regard to the identity of the person who had outwitted him, I thought it a pity not to give him a clue." (122)
Here's a rare moments in this story where a character wants to reveal, rather than alter or conceal reality. This fits in with Dupin as being the only character who can really see real reality. (Is that real enough for you?)