Misfortune tests friends, and detects enemies.
In the moment when I truly understand my enemy, understand him well enough to defeat him, then in that very moment I also love him.
A flatterer is a secret enemy.
Keep your enemies in front of you.
You have enemies? Good. That means you've stood up for something, sometime in your life.
Never interrupt your enemy when he is making a mistake.
You can discover what your enemy fears most by observing the means he uses to frighten you.
Enemies are so stimulating.
Use your enemy's hand to catch a snake.
Speed is the essence of war. Take advantage of the enemy's unpreparedness; travel by unexpected routes and strike him where he has taken no precautions.
A man cannot be too careful in the choice of his enemies.
If your opponent is of choleric temperament, seek to irritate him.
It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle.