The Revolt Against Dualism An Inquiry Concerning The Existence Of Ideas is a philosophical book written by Arthur O. Lovejoy. The book explores the concept of dualism, which is the belief that the world is made up of two opposing forces or principles, such as mind and matter or good and evil. Lovejoy argues that this dualistic view of the world has been challenged throughout history by philosophers who believe in the existence of ideas as a third, independent category of reality. The book traces the historical development of this idea, from ancient Greek philosophy to the modern era. Lovejoy examines the works of philosophers such as Plato, Aristotle, Descartes, and Kant, and shows how they have grappled with the question of the existence of ideas. He also discusses the role of language and cultural factors in shaping our understanding of reality.Lovejoy's argument is that the revolt against dualism is not a recent development, but rather a long-standing philosophical tradition. He con