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The Master said: Swords are divided into three categories: the common man's sword, the gentleman's sword, and the emperor's sword. Common man's sword: He commits murder and fights ruthlessly, and he goes through the streets with arrogance. The Gentleman's Sword: Bravery is the front, honesty is the sword, virtuousness is the backbone, and loyalty is the sword. The Sword of the Son of Heaven: The world is the front, the mountains and the sea are the harpoons, it is controlled by the five elements, it is opened by the yin and yang, it is held by the spring and autumn, it moves by the autumn and winter, it is unparalleled in the world, and all swords are subdued.