A theme that continuously shows in The Screwtape Letters is proving Christianity true by exploring evil. I have chosen letter four, nineteen, and twenty-one to display this theme. In letter four Wormwood is using praying as an evil. He tells Screwtape that his advice to tempt the Patient to keep pray for his mother non-specific and dull, has “proved singularly unfortunate”. Screwtape also scolds Wormwood for talking down to a “under-secretary of a department” when Wormwood is only a “junior tempter” (15). One of the Devil’s plan is to “keep the patient from serious intention of praying altogether”. He plans to do so by trying to get the Patient to remember his childhood prayers, when prayer time was not taken seriously and was very juvenile.