"Loneliness" is a famous philosophical treatise by the Austrian writer Johann Georg Zimmermann. The book provokes the reader to think about the nature of loneliness, its influence on a person and his place in the world. The author explores various aspects of loneliness, expressing his thoughts on the topic of relationships with other people, the role of society and self-determination in life. "Loneliness" is an invitation to feel the depth of one's inner world and understand the importance of preserving personal identity in the modern world.