“Your Worst Enemy Could Be Your Best Friend && Your Best Friend Your Worst Enemy”

“Keep your enemies close, but your friends closer. That way your friends are between you and your enemies.”

“Only a true best friend can protect you from your immortal enemies.”

“And I was holding someone who was destined to be my best friend, or possibly my worst enemy.”

“Count me not your friend but the enemy of your enemies.”

“Always sleep with one eye open. Never take anything for granted. Your best friends might just be your enemies.”

“You've got to take it on faith that the enemy of your enemy is your friend.”

“The final level - of good ethics - is to deal with your enemy in the best kind of treatment as though he is a close friend!”

“If you refrain from judging your worst enemy, his children will come to your side. What more severe judgment could come upon an enemy than this?”

“By the time you're thirty, your worst enemy is yourself.”