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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Art of War by Sun Tzu: the converted spy into our service, because it is he that knows
which of the local inhabitants are greedy of gain, and which of
the officials are open to corruption."]
23. It is owing to his information, again, that we can
cause the doomed spy to carry false tidings to the enemy.
[Chang Yu says, "because the converted spy knows how the
enemy can best be deceived."]
24. Lastly, it is by his information that the surviving spy
can be used on appointed occasions.
25. The end and aim of spying in all its five varieties is
knowledge of the enemy; and this knowledge can only be derived,
The Art of War | 
