"The Man in the Moon, or the Train of the Heart - the Voice of Fate" is a fantastic novel by the famous German writer Wilhelm Hauff. In this book, the author dares the then-popular philosophy of H. Klauren, known as the "man in the moon", through which a trip to the moon takes place. The main character communicates with a cunning man in the moon and studies life on this mysterious planet. However, he is convinced by his own experience that true destiny is not governed by external forces, but by internal experiences and choices. In "Controversial Sermon" Gauff examines important questions between the spiritual and material spheres of life. This is a work that captivates with its philosophy and deep moralistic content, leaving the reader with an uplifted mood and a desire to think about the big questions of life. "Der Mann im Mond, or zug des Herzens ist des Schicksals Stimme" is a work that will be able to impress even in the modern era with its relevance and depth of thoughts.