Page:Sun Tzu on The art of war.djvu/220

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  1. 故用間有五有鄉間有內間有反間有死間有生間
  2. 五間俱起莫知其道是謂神紀人君之寶也
  3. 鄉間者因其鄉人而用之

7. Hence the use of spies, of whom there are five classes: (1) Local spies; (2) inward spies; (3) converted spies; (4) doomed spies; (5) surviving spies.

8. When these five kinds of spy are all at work, none can discover the secret system. This is called “divine manipulation of the threads.” It is the sovereign's most precious faculty.

9. Having local spies means employing the services of the inhabitants of a district.