Chapter 5, Verses 16 and 17 - Sun Tzu

Amid the turmoil and tumult of battle, there may be seeming disorder and yet no real disorder at all; amid confusion and chaos, your array may be without head or tail, yet it will be proof against defeat. Simulated disorder postulates perfect discipline, simulated fear postulates courage; simulated weakness postulates strength.
~ from The Art of War, Giles translation ~

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