This book is about the gap between the moral demand on us and our matural capacities to meet it. John Hare starts with Kant's statement of the moral demand and his acknowledgement of this gap. Hare then analyses Kant's use of the resources of the Christian tradition to make sense of this gap, especially the notions of revelation, providence, and God's grace. Kant reflects the traditional way of making sense of the gap, which is to invoke God's assistance in brigding it. Hare goes on to examine various contemprary philosophers who do not use these resources. He considers three main strategies; exaggerating our natural capacities, diminishing the moral demand, and finding some naturalistic substitute for God's assistance. He argues that these strategies do not work, and that we are therefore left with the gap and with the problem that it is unreasonable to demand of ourselves a standard which we cannot reach. In the final section of the book, Hare looks in more detail at the Christian doctrines of atonement, justification, and regeneration. He discusses Kierkegaard's account of the relation between the ethical life and the Christian life, and ends by considering human forgiveness of each other. The book is intended for those interested in both ethical theory and in Christian theology.