13. The Use of Spies


Now this foreknowledge cannot be elicited from spirits; it cannot be obtained inductively from experience,

Tu Mu's note is: "[knowledge of the enemy] cannot be gained by reasoning from other analogous cases."

nor by any deductive calculation.

Li Ch`uan says: "Quantities like length, breadth, distance and magnitude, are susceptible of exact mathematical determination; human actions cannot be so calculated."

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