Satan cannot upset the lives of believers unless he has God's permission. Before God allows us to fail, we can be sure that our Lord Jesus Christ has already prayed for us. God's purpose in allowing us to fail is that we might return to Him and be useful to Him like we could not have been useful before. Christian, the next time you are in the devil's den, remember you can't do it on your own, the victory can be yours through your Lord and Savior, Jesus Christ. Other passages: Job 1-2; John 6:35, 37-39.