Read Ephesians 2:2 Using Other Translations
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:
in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience--
You used to live in sin, just like the rest of the world, obeying the devil—the commander of the powers in the unseen world. He is the spirit at work in the hearts of those who refuse to obey God.