Chapter 13, Verses 4 and 5 - Sun Tzu

Thus, what enables the wise sovereign and the good general to strike and conquer, and achieve things beyond the reach of ordinary men, is foreknowledge. Now this foreknowledge cannot be elicited from spirits; it cannot be obtained inductively from experience, nor by any deductive calculation.
~ from The Art of War, Giles translation ~

Go here to read the introductory post to the verses of The Art of War.