Of all rewards none [is] more liberal than those given to secret agents.
Carefully compare the opposing army with your own, so that you may know where strength is superabundant and where it is deficient.
Opportunities multiply as they are seized.
There is no instance of a nation benefiting from prolonged warfare.
So it is that good warriors take their stance on ground where they cannot lose, and do not overlook conditions that make an opponent prone to defeat.
Defeat the enemies strategy.