Vincent Brümmer's classic book on prayer from 1984 provides a comprehensive philosophical analysis of central issues regarding the nature and practice of prayer. This new edition has been substantially revised and updated. Serving as a valuable core text for students, this book also contributes to a number of current debates in theology and philosophy of religion: the debates on realism and religious belief, on the rationality of faith and the nature of theology, on the relation between religious belief and morality, on the relation between science and religion and the lively debate among evangelical Christians in America on the 'openness of God.'