If you are far from the enemy, make him believe you are near.

Balk the enemy's power; force him to reveal himself.

If ignorant both of your enemy and yourself, you are certain to be in peril.

Hence the saying: If you know the enemy and you know yourself, your victory will not stand in doubt; if you know Heaven and you know Earth, you may make your victory complete.

To know your Enemy, you must become your Enemy.

If you know the enemy and know yourself you need not fear the results of a hundred battles.