What the Bible says about God Sets Limits on Satan and Demons
(From Forerunner Commentary)
Here is a principle that we can take great comfort in. As He does with Job, God also deals with us. God has set limits on what Satan or the demons are able to do with or to us. God deals with us according to the measure of our faith, our love, the measure of His Spirit within us. By faith, we have to deal with what He allows to occur, understanding that we love God for what He is and not because He has given us good things. That is an additional blessing.
We see, then, that from time to time we will have to overcome the demons that God allows to test us.
John W. Ritenbaugh
Satan (Part 1)