How can "casting out devils" in Christ's name be a work of "iniquity?"
The commandment at the front end is to not take the Lord's name in vain. (Exo. 20: 7.) The result at the back end is revealed here. Take care in how you presume your acts are in harmony with Him. Until He speaks to you, and affirms that you have a work to do for Him, you may only be working iniquity.