Friends make the worst enemies.
The biggest misfortune for Dazai's enemies is that they are enemies.
I choose my allies carefully, and my enemies more carefully still.
Always keep your foes confused. If they are never certain who you are or what you want, they cannot know what you are like to do next.
Your worst enemy could be your best friend, and your best friend your worst enemy.
— I heard it was best to keep your enemies close.
— Whoever said that didn't have many enemies.
It's a sad thing not to have friends, but it is even sadder not to have enemies.