God's Spirit, who is in you, is greater than the devil, who is in the world.
1 John 4:4
Satan has no power except that which God gives him.
To the first-century church in Smyrna, Christ said, "Do not be afraid of what you are about to suffer. I tell you, the devil will put some of you in prison to test you, and you will suffer for ten days. But be faithful, even if you have to die, and I will give you the crown of life." Revelation 2:10
Analyze Jesus' words for a minute. Christ informs the church of the persecution, the duration of the persecution (ten days), and the outcome of the persecution (a crown of life). In other words, Jesus uses Satan to fortify His church.....Even when Satan appears to win, he loses.
Praise our mighty God!!