In the Bible, there is a verse in Matthew that states "Why do you look at the speck of sawdust in your brother's eye and pay heed not to the plank in thine own eye? (Matt. 7:3) In many of Poe's stories he illustrates this biblical truth that people tend to focus on and focus on the imperfections and mistakes of others. completely ignoring theirs. So, even amid all his logic and love, nothing is enough to stop him from murdering the old man. The thought of that vulture's eye motivates every methodically calculated move of the narrator. The only reason for the old man's murder depends on a disproportionate reason.