Some of these books are focused more on war and military science (Art of War, Book of Five Rings, Hagakure), others are more self-reflective and develop an ethical philosophy (Analects, Meditations), and others still are focused more on politics and ruling (Arthashastra, The Prince). Each of these books provides a unique and historical perspective regarding these topics, and they complement each other in tracing deep insight into the nature of leadership, war, politics, and statecraft.