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

Know your enemy and know yourself and you can fight a hundred battles without disaster.

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

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.

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

To know your Enemy, you must become your Enemy.