“Reveal not every secret you have to a friend, for how can you tell but that friend may hereafter become and enemy. And bring not all mischief you are able to upon an enemy, for he may one day become your friend.”
“If you know your enemy as you know your friend," her mother had said when she gave Mei the book, "then there is hope your enemy will become your friend.”
“Best friends make the worst enemies, they know all your secrets and how to hurt you the most.”
“common enemies make enemies become friends!”
“If this is how you treat your friends, no wonder you have so many enemies.”