What is the narrator trying to persuade his readers to believe in "The Tell- Tale Heart" (with evidence from the text)

The narrator is trying to persuade the reader of his sanity. He claims that the calm way he can tell the story is evidence of his mental health. This is the second time the narrator attempts to "prove" his sanity. As you continue to read the text, keep an eye out for more instances of this.

well, there are online sites that can make it look like a texting screenshot, so u can make it like hamilton texting jefferson through that, and he can start with him being like, i know it's out of the blue, but blah blah blah