WHEN one person is owned by another person, and has to work for him, he is called a slave, or a bond-servant, because he is in bondage, and not free to do what would be best for himself.
So it is with one who lets himself be controlled by the evil instead of by the good. The word devil is like the word evil, and means the same. To do evil is to do as the devil wishes us to do. Put d before evil, and you will see where evil comes from.
A slave can not get free from a cruel master. He has no money to buy his own freedom, and no power to get away. If he tries to escape, he is followed and caught, and brought back again to work for his hateful owner.