To know your Enemy, you must become your Enemy.

the opportunity of defeating the enemy is provided by the enemy himself.

Be where your enemy is not.

One need not destroy one's enemy. One need only destroy his willingness to engage.

Keep your fiends close and your enemies even closer.

Those who would wage war, should first eliminate all domestic enemies before proceeding to attack the external foe.

It is sufficient to estimate the enemy situation correctly and to concentrate your strength to capture him. There is no more to it than this. He who lacks foresight and underestimates his enemy will surely be captured by him.

Attack the enemy's strategy.

Pretend to be weak, so your enemy may grow arrogant.