I have attempted to show that the notion of délire has been central to two distinct but related traditions at work in contemporary French philosophy. The first, which was considered in Chapters 2 and 4, uses linguistic and psychoanalytic concepts; whereas the second, expounded in Chapters 3 and 5, is based on the rereading of certain texts of classical philosophy (the Stoics, for instance), and draws on the findings of psychiatry and political economy.