Sabahattin Ali’s “The Devil Within” is a powerful psychological novel that explores the inner conflicts and weaknesses of a human being. The story portrays a person who, under the influence of society, loses his will and shifts the blame for his actions onto the “devil within.” The main character avoids responsibility and ultimately loses his internal struggle, leading to the gradual destruction of his life. Themes of love, fear, weakness, and moral decline develop in parallel throughout the novel. The author shows that a person’s greatest enemy is often hidden within themselves