I listened to a great talk by John Piper the other day called "10 Aspects of God's Sovereignty Over Suffering & Satan's Hand In It". It can also be found in written form, along with many other great articles, in the book "Suffering and the Sovereignty of God".
This article by Piper listed 10 excellent reasons to hope in our sovereign God. Satan is real. And he is a powerful enemy. But the battle and the end result does not belong to him. In fact, his power is always subject to our sovereign God.
There is immense hope in that fact. And the knowledge that our God is greater brings much comfort, even in the midst of suffering. If you have time, download these talks here and enjoy the encouragement that comes from knowing that our powerful God is in control. And ultimately, He is victorious.
"And they marched up over the broad plain of the earth...but fire came down from heaven and consumed them, and the devil who had deceived them was thrown into the lake of fire and sulfur where the beast and the false prophet were, and they will be tormented day and night forever and ever." Revelation 20:9 & 10