The Retreat of Reason brings back to philosophy the ambition of offering a broad vision of the human condition. One of the main original aims of philosophy was to give people guidance about how to live their lives. Ingmar Persson resumes this practical project, which has been largely neglected in contemporary philosophy, but his conclusions are very different from those of the ancient Greeks. They typically argued that a life led in accordance with reason, a rational life, would also be the happiest or most fulfilling. By exploring the irrationality of our attitudes to time, identity, and responsibility, Persson shows that the aim of living rationally conflicts not only with the aim of leading the most fulfilling life, but also with the moral aim of promoting the maximization and just distribution of fulfilment for all. The Retreat of Reason challenges some of our most fundamental ideas about ourselves.