勢因敵動
Momentum Arises from the Enemy's Movement
武王問太公曰:「攻伐之道奈何?」太公曰:「勢因敵家之動,變生於兩陣之間,奇正發於無窮之源。故至事不語,用兵不言。且事之至者,其言不足聽也;兵之用者,其狀不足見也。忽而往,忽而來,能獨專而不制者,兵也。
King Wu asked Taigong: 'What is the way of attack and conquest?' Taigong said: 'Momentum arises from the enemy's own movement. Transformation is born between the two battle lines. The orthodox and the unorthodox spring from an inexhaustible source. Therefore the most critical affairs are never spoken of, and the employment of troops is never discussed. In the most critical affairs, words are not worth hearing. In the employment of troops, their shape is not worth seeing. They depart suddenly, they arrive suddenly. That which can act independently without being controlled — that is the army.'
