“If you know the enemy and know yourself you need not fear the results of a hundred battles.”
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If we know that our own men are in a condition to attack, but are unaware that the enemy is not open to attack, we have gone only halfway towards victory.
Secret operations are essential in war upon them the army relies to make its every move.
Now the reason the enlightened prince and the wise general conquer the enemy whenever they move and their achievements surpass those of ordinary men is foreknowledge.
In the practical art of war, the best thing of all is to take the enemy's country whole and intact to shatter and destroy it is not so good.