Without some foothold in us, Satan cannot operate. Hence, his first tempting of us will be aimed at securing some ground; the next will be an assault from the ground he has secured. One very large territory, perhaps the largest, that he operates from is fear.
'Fear is Satan's calling card,' a beloved counselor used to say to me. Whenever you accept his calling card, you will receive a visit from him. Fear him and he comes; fear not and he is held at a distance. No child of God need be fearful of Satan, even though he roar as a lion and his teeth are drawn. Within us is One who by demonstration is greater than he.
The Joyful Heart (Watchman Nee 主僕倪柝聲弟兄)
Read the Scriptures: Ephesians 4