What is the clincher sentence for entire selection in the tell tale heart?

The clincher sentence in "The Tell-Tale Heart" by Edgar Allan Poe is the narrator's confession: "Villains! Dissemble no more! I admit the deed! Tear up the planks! Here, here! It is the beating of his hideous heart!" This sentence reveals the narrator's guilt and paranoia, as he can no longer contain his guilt and reveals the source of the mysterious sound he hears. It serves as the climax of the story, showcasing the narrator's descent into madness and ultimate confession of his crime.