The quote from Shakespeare's "Macbeth," where Lady Macbeth expresses her guilt and moral conflict, reveals her inner turmoil after committing a crime. She compares her hands, stained with the blood of King Duncan, to Macbeth's, indicating that they are equally culpable. However, her remark about being ashamed to have a "heart so white" highlights her feelings of guilt and her desire to appear unblemished in conscience, contrasting innocence with the reality of her actions.

This statement encapsulates the theme of guilt that permeates the play. Lady Macbeth's ambition drives her to push Macbeth towards murder, yet the act haunts her, leading to her eventual descent into madness. Thus, the interplay of appearance versus reality underscores the psychological consequences of their ambition and the moral decay that follows their actions.