 He's already done battle with the evil one in the temptation in the wilderness. He's already set back the kingdom of the evil one in the casting out of demons. He's already shown himself to be the king prevailing over the forces that are arranged against him. And he knows that as the seed of the word of God is sown, the activity of the evil one is always present. It may just simply be a voice in your head saying to you, oh, you don't have to listen to this.