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If you know the enemy and know yourself you need not fear the results of a hundred battles.
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.
It is only the enlightened ruler and the wise general who will use the highest intelligence of the army for the purposes of spying, and thereby they achieve great results.
The enlightened ruler is heedful, and the good general full of caution.