《六韬·龙韬·军势》
用兵最重要的莫过于所攻必克，作战最重要的莫过于保守机密，行动最重要的莫过于出其不意，计谋最重要的莫过于神妙难测。
事莫大于必克，用莫大于玄默，动莫神于不意，谋莫善于不识。
The most important thing in using troops is to win the attack, the most important thing in combat is to keep secrets, the most important thing in action is to surprise, and the most important thing in strategy is to be unpredictable.