The devil knows all the clever moves. He will move in worldliness and move out prayer. He will move in error and move out truth. He will move in guilt and move out confidence in Jesus. Eventually, he will bring doubt and destroy faith. That's why Jesus constantly reminds us to keep watching and praying and not to let our guard down. "Watch and pray, lest you enter into temptation. the spirit indeed is willing, but the flesh is weak." (Mark 14:38)