I can surfice to say that eyes are ever watchful
Yes this has always been good advice.
I keep my friends close and I know my enemy.... but they can stay the fk away. That is what busy bodies and spies are for. No need to contaminate your group of friends.
I keep my friends far as they could also be my enemy!
Live in the same building as your friends, but your enemy is your next door neighbor. :O
I don't have enemies.