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a young man, C. S. Lewis had served in the awful trenches of World War I, and in 1940, when the bombing of Britain began, he took up duties as an air raid warden and gave talks to men in the Royal Air Force, who knew that after just thirteen bombing missions, most of them would be declared dead or missing. Their situation prompted Lewis to speak about the problems of suffering, pain, and evil, work that resulted in his being invited by the BBC to give a series of wartime broadcasts on Christian faith. Delivered over the air from 1942 to 1944, these speeches eventually were gathered into the book we know today as Mere Christianity.
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C.S. Lewis (Mere Christianity)