Ephesians 2:2

Ephesians 2:2. Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience.

You were once no better than the workshop of the devil. He is the spirit that worketh in the children of disobedience, as the smith works in his forge. When you hear foul language, when you see bad actions, these are the sparks coming out of the chimney that let you know who is at work within, down below. What a dreadful thing it is - a man dead to all that is good, but alive through the indwelling of the devil that is within him. "The spirit that now worketh in the children of disobedience."