Quote: "I had no fear, however, as I went down to open the door."

Example: The narrator's irrational confidence is demonstrated when he calmly invites police officers into the house while the victim's body lies hidden beneath the floorboards.

Highlight: His belief in hearing the dead man's heartbeat and assumption that officers are playing mind games with him reveals severe paranoid delusions.

Quote: "It was open - wide, wide open..."

Highlight: The narrator's unnecessary repetition of words and actions, particularly during the murder sequence, indicates compulsive behavior typical of mental illness.

Definition: The text defines insanity through behavioral patterns, including doing the same actions repeatedly while expecting different results.

Quote: "And so, I finally decided I had to kill the old man and close the eye forever!"

Highlight: The narrator's paradoxical claim of loving the old man while simultaneously planning his murder demonstrates severe cognitive dissonance.

Definition: Insanity is defined as a mental illness that prevents individuals from correctly interpreting reality and distinguishing right from wrong.