Page:Sun Tzu on The art of war.djvu/228

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  1. 必索敵人之間來間我者因而利之導而舍之故反間可得而用也
  2. 因是而知之故鄉間內間可得而使也
  3. 因是而知之故死間爲誑事可使告敵
  4. 因是而知之故生間有使如期


21. The enemy's spies who have come to spy on us must be sought out, tempted with bribes, led away and comfortably housed. Thus they will become converted spies and available for our service.

22. It is through the information brought by the converted spy that we are able to acquire and employ local and inward spies.

23. It is owing to his information, again, that we can cause the doomed spy to carry false tidings to the enemy.

24. Lastly, it is by his information that the surviving spy can be used on appointed occasions.