Spies cannot be usefully employed without a certain intuitive sagacity; They cannot be properly managed without benevolence and straightforwardness; Without subtle ingenuity of mind, one cannot make certain of the truth of their reports; Be subtle! be subtle! and use your spies for every kind of warfare; If a secret piece of news is divulged by a spy before the time is ripe, he must be put to death together with the man to whom the secret was told.
Sun TzuIf you fight with all your might, there is a chance of life; where as death is certain if you cling to your corner
Sun TzuIf I am able to determine the enemy's dispositions while at the same time I conceal my own, then I can concentrate and he must divide.
Sun Tzu