More wisdom from Sun Tzu.
13. The Use Of Spies
- Now this foreknowledge cannot be elicited from spirits; it cannot be obtained inductively from experience, nor by any deductive calculation.
- Knowledge of the enemy’s dispositions can only be obtained from other men.
- 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.
