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With the establishment of more and more courses of study at the evangelical colleges, the everyday life of the Christian community was also increasingly influenced. The historian Stefanie Coché thus speaks of an orthopractical turn in this context. This took place under Charles Fuller's follower, Billy Graham, as the most important preacher in the 20th century and manifested itself, among other things, in the fact that preachers from then on gave detailed instructions on how a Christian should live – how does a Christian behave in everyday life in the family? How does a good Christian drive a car?