Summary
This quote suggests that the speaker perceives themselves as different from a madman solely because they are aware of their own sanity. It highlights the underlying awareness and self-assurance that the speaker possesses about their mental state. By asserting their sanity, the quote implies that the speaker distinguishes themselves from individuals who might be deemed insane or irrational. It demonstrates the speaker's confidence in their own rationality and serves to emphasize the importance they place on retaining a grasp on their mental faculties.