From the seven sons of Sceva we learn two very important things:
(1) Satan knows who you are. The demons in this man spoke to the sons of Sceva, saying, ‘Jesus I know, and Paul I know; but who are you?’ (Acts 19:15 NKJV) Question: Do you have the kind of relationship with God that causes Satan to know your name, and acknowledge that you’re a force to be reckoned with? When God asked Satan, ‘Have you noticed My servant, Job?’ he basically replied, ‘Yes, and every time I come up against him I hit a force field I can’t penetrate.’ (See Job 1:8–12). Maybe you’re preoccupied with your own inadequacy, thinking you’re not up to the job, or you’re not good enough. Understand this: it’s not you the enemy’s afraid of—it’s God’s Spirit within you!
(2) When ‘the evil day’ comes, you discover if you have what it takes. Paul said, ‘Take up the whole armour of God, that you may be able to withstand in the evil day.’ (Ephesians 6:13 NKJV) The demons in the man recognised the weaknesses in the seven sons of Sceva and stripped them of their pretence. You will only survive if your faith is genuine, because one day you’ll have to walk with God when you can’t understand or explain where He’s taking you. Your techniques and talents won’t get you through. You’re going to have to stand on His Word when it doesn’t look like it’s working for you. That’s when you discover it’s ‘“not by might nor… power, but by My Spirit,” says the Lord.’ (Zechariah 4:6 NKJV)