After seeing Paul cast out demons in the name of Jesus, the seven sons of Sceva, who called themselves exorcists, tried to do the same. The demon, who did not recognize their authority, for they had none, lashed out at them and humiliated them. From their example, we see that
If we are to do spiritual battle, we must be sure that we put on the armor that God provides for us. Without it, we are prey for Satan and his followers.