Know your enemy, know his sword.

It pays to know the enemy - not least because at some time you may have the opportunity to turn him into a friend.

Before we can master an enemy, we must know its name, its habits, and its place of abode.

You can discover what your enemy fears most by observing the means he uses to frighten you.

A man can condemn his enemies, but it’s wiser to know them.

Knowing the enemy enables you to take the offensive, knowing yourself enables you to stand on the defensive.

If you have an enemy, then learn and know your enemy, don't just be mad at him or her

If one man does not make a move, the other must, and by permitting the adversary to make the attack one learns something about him.

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

You win battles by knowing the enemy's timing, and using a timing which the enemy does not expect.

Climbing into the ring, the best-prepared fighter is the one who has tried to understand their opponent. Especially if it’s yourself.

Listen to your political enemies, especially the smart ones, and then figure out a way to make them laugh.

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

The enemy is a very good teacher.