The main theme is the fragility of sanity, guilt versus innocence, and the unrelenting passage of time. The fragility of sanity: the narrator's attempt to prove his sanity, his erratic mannerisms while he explains his meticulous plans for killing the old man only prove his madness.
Uhmm
A little more specific please.
I Believe That Is False, When You Take Notes You Have To Diligently Listen To Make Sure You Wrote The Correct Information So Your Mind Does Not Have Time To Wander. That Is Why People Who Write Notes Retain More Information. :) <span />