God uses the devil and the evil angels. They, of course, desire to ruin everything; but God blocks them, unless a well-earned scourging is in order. God allows pestilence, war, or some other plague to come, that we may humble ourselves before Him, fear Him, hold to Him, and call upon Him. When God has accomplished these purposes through the scourge, then the good angels come again to perform their office. They bid the devil stop the pestilence, war, and famine. So the devil must serve us with the very thing with which he plans to injure us; for God is such a great Master that He is able to turn even the wickedness of the devil into good
Martin Luther
