Lady Macbeth, one of the main characters in the play Macbeth, is an example of a character that throughout the course of the play has had a change of heart of some sorts. Lady Macbeth's conscience, which seems to have never appeared or mattered to her before, suddenly becomes an uncontrollable part of her psychological state of being.

Murder, which she deemed as such a small inconsequential act, later causes her to lose sleep and finally to take her own life.

In the beginning of the play, when Lady Macbeth is first introduced she is already plotting Duncan's murder. She even wishes that she were not a woman so that she could do it herself saying in Act I, Scene 5, "Come, you spirits that tend on mortal thoughts, unsex me here." Lady Macbeth manipulates her husband with astonishing success, overruling all his objections. When he does not wish...