Understand that some of your enemies are amongst your best friends.

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

Know your enemy, know his sword.

Know your enemy — and learn about his favorite sport.

To combat an adversary, become their friend.

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

When you have an enemy it is wise to know his ways. The King knew as much about Grey as any man could know about another.

Till the enemy's weakness is known , he should be kept on friendly terms.

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

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

A man may learn wisdom even from a foe.

Without enemies around us, we grow lazy. An enemy at our heels sharpens our wits, keeping us focused and alert. It is sometimes better, then, to use enemies as enemies rather than transforming them into friends or allies.

To make peace with an enemy one must work with that enemy, and that enemy becomes one’s partner.

Today's enemies can be your friends tomorrow. And today's friends can be tomorrow's enemies.