El llibre de la guerra: el clàssic militar de l'Extrem Orient

To all nations War is a great matter. Upon the army death or life depend: it is the means of the existence or destruction _of the State_. Therefore it must be diligently studied. Now, in war, besides stratagem and the situation, there are five indispensable matters. The first is called The Way;[1] the second, Heaven; the third, Earth; the fourth, the Leader; the fifth, Law. The _Way_ or the proper conduct of man. If the ruling authority be upright, the people are united: fearless of danger, their lives are at the service of their Lord. _Heaven._ Yin and Yang;[2] heat and cold; time and season. _Earth._ Distance; nature; extent; strategic position. The _Leader_. Intelligence; truth; benevolence; courage and strictness. _Law._ Partition and ordering of troops. These things must be known by the leader: to know them is to conquer; to know them not is to be defeated. Further, with regard to these and the following seven matters, the condition of the enemy must be compared with our own. The seven matters are:-- The virtue of the prince; the ability of the general; natural advantages; the discipline of the armies; the strength of the soldiers; training of the soldiers; justice both in reward and punishment. Knowing these things, I can foretell the victor. If a general under me fight according to my plans, he always conquers, and I continue to employ him; if he differ from my plans, he will be defeated and dismissed from my service. Wherefore, with regard to the foregoing, considering that with us lies the advantage, and the generals agreeing, we create a situation which promises victory; but as the moment and method cannot be fixed beforehand, the plan must be modified according to circumstances.…