the philosopher and archeologist Felix Ravaisson deals with the study of habit by using a broad spectrum of sources ranging from Aristotle to Butler, Leibniz, Hume, Main de Biran and Schelling, among oth-ers. The combination of these authors together with the originality of Ravaisson’s own results produces a work which, though brief, has inspired some of the most important contemporary philoso-phers1. Moreover, this book has recently (2008) been translated into English for the first time, which has favored its rediscovery and redefinition in the context of current debates. Indeed, Ravaisson seems to have found in the study of habit a key point for the solution of some of the fundamental problems of philosophy such as the rela-tionship betwe...