There is a devil inside each one of us. Some just know to hide it too well.

Come,' he said, 'come, we must see and act. Devils or no devils, or all the devils at once, it matters not; we fight him all the same.

Who are you then?"
"I am part of that power which eternally wills evil and eternally works good.

We are all the gods and devils, hiding under the human skin.

Devil is just "evil" with a "d" and God is just "good" without an "o"

Better the Devil you know than the Devil you don't