"The Purity of the Ideal" is a book written by the Swedish writer Arvid Jarnefelt, which is a unique work about the concept of purity in all its manifestations. The author investigates the nature of purity as a moral, aesthetic and religious phenomenon, revealing its influence on human life. The book opens up a broad aspect of this topic, reflecting on the importance of cleanliness for the individual and society as a whole. "The Purity of the Ideal" is a work that forces the reader to rethink his idea of virtue and morality, and also prompts him to think about how we can improve our lives by observing purity in all its manifestations.