Chapter 30, Part E - Chuang Tzu

"There is the sword of the Son of Heaven, the sword of the feudal lord, and the sword of the commoner."

"What is the sword of the Son of Heaven like?" asked the king.

"The sword of the Son of Heaven? The Valley of Yen and the Stone Wall are its point, Ch'i and Tai its blade, Chin and Wey its spine, Chou and Sung its sword guard, Han and Wei its hilt.' The four barbarian tribes enwrap it, the four seasons enfold it, the seas of Po surround it, the mountains of Ch'ang girdle it. The five elements govern it, the demands of punishment and favor direct it. It is brought forth in accordance with the yin and yang, held in readiness in spring and summer, wielded in autumn and winter.

"Thrust it forward and there is nothing that will stand before it; raise it on high and there is nothing above it; press it down and there is nothing beneath it; whirl it about and there is nothing surrounding it. Above, it cleaves the drifting clouds; below, it severs the sinews of the earth. When this sword is once put to use, the feudal lords return to their former obedience and the whole world submits. This is the sword of the Son of Heaven."
~ Burton Watson translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Chuang Tzu.