The document describes the narrator's childhood fear of water due to a belief that ghosts lived in it. One night, the narrator had a dream where a boy led them into a lake, holding their hand and calming their fears. From then on, the narrator no longer feared water and enjoyed swimming. Years later, near a lake, the narrator encountered a man who helped them and realized it was the same boy from their childhood dream, showing that dreams can profoundly impact one's life.