This essential core text introduces readers to metaphysics. In thoughtful and engaging prose, Peter van Inwagen examines three profound questions: What are the most general features of the world? Why is there a world? And, what is the place of human beings in the world? The third edition includes an entirely new chapter on ontology. The new chapter presents a theory of the nature of being and proceeds to apply this theory to two problems of ontology: the problem of non-existent objects and the problem of universals. Equally valuable as a textbook in a university course or an introduction to metaphysical thinking for the interested layperson, Metaphysics remains a fascinating book for a wide range of readers, from first-time students to the most sophisticated philosophers.Contents1. IntroductionPart One: The Way the World Is 2. Individuality 3. Externality 4. Temporality 5. ObjectivityPart Two: Why the World Is 6. Necessary Being: The Ontological Argument 7. Necessary Being: The Cosmological ArgumentPart Three: The Inhabitants of the World 8. What Rational Beings Are There? 9. The Place of Rational Beings in the World: Design and Purpose 10. The Nature of Rational Beings: Dualism and Physicalism 11. The Nature of Rational Beings: Dualism and Personal Identity 12. The Powers of Rational Beings: Freedom of the Will 13. Concluding Meditation 14. Coda: Being