The devil has the power to assume a pleasing shape.

Better the devil you know than the devil you don't.
The greatest trick the Devil ever pulled was convincing the world he didn't exist.
The devil tempts all other men, but idle men tempt the devil.
The devil's best trick is to persuade you that he doesn't exist.
You have to meet the devil to find out if he is as bad as he is painted.
Keep your friends close, your enemies closer, and the devil within sight.
The devil is a better theologian than any of us and is a devil still.

If you want to meet the devil, just look in the mirror.

When you make a deal with the devil, you're going to get burned.