Pretend to be weak, so your enemy may grow arrogant.
Knowledge of the enemy's dispositions can only be obtained from other men.
Of all rewards none [is] more liberal than those given to secret agents.
They [spies] cannot be properly managed without benevolence and straightforwardness.
The expert in battle seeks his victory from strategic advantage and does not demand it from his men.
When the enemy is at ease, be able to weary him; when well fed, to starve him; when at rest, to make him move. Appear at places to which he must hasten; move swiftly where he does not expect you.