This book on the philosophy of religion discusses the concept of aseity, the idea that God is independent of anything else. The author examines different dimensions of aseity, such as God's immutability, the non-modular nature of his mind, and the independence of accidental properties. He argues that aseity can be defended even if God is required to create the best possible world. However, the author also raises questions about the relevance of certain dimensions of aseity and whether they actually contribute to a more complete understanding of God. He ends with a note on the importance of not reducing God to a mere object of philosophical study and the need to keep God's personal and transcendent nature in mind.