"The idea that God, as the most perfect being, creates the best possible world necessarily, is often under-acknowledged by contemporary theologians and philosophers of religion. This book clearly demonstrates the rationale for what Justin Daeley terms theistic optimalism and interacts with the existing literature in order to highlight its limitations. Extending the conversation beyond the well-covered issue of divine freedom, Justin Daeley argues that Theistic Optimalism is also consistent with divine aseity, divine gratitude and our typical modal intuitions. By offering plausible solutions to each of the criticisms levelled against Theistic Optimalism, he provides a vigorous and original defence against the charge that it deviates from the Christian tradition. Engaging with both the Christian tradition and contemporary Christian theologians, Why God Must Do What is Best positions the idea of Theistic Optimalism firmly within the language of contemporary philosophy of religion."--