H.G. Wells' The Man Who Could Work Miracles

While vigorously asserting the impossibility of miracles, George McWhirter Fotheringay suddenly discovers that he can perform them. After being thrown out of a bar for what is thought to be a trick, he tests his powers and eventually sends a policeman to Hades by accident. Worried, he sends the police officer to San Francisco and seeks advice from the local clergyman, Mr. Maydig who, after having Fotheringay's powers demonstrated to him, quickly plans for world reform by means of miracle. Meanwhile, his boss wants to exploit Fotheringay's powers to expand his business. When Fotheringay implements some of Maydig's principles on a small scale, changing several of the local gentry's "immoral" possessions, they decide Something Must Be Done about him.