Flix Ravaissons seminal philosophical essay, Of Habit, was first published in French in 1838. It traces the origins and development of habit and proposes the principle of habit as the foundation of human nature. This metaphysics of habit steers a path between materialism and idealism in one of the best and most sophisticated treatments of the topic. Ravaissons work was pivotal in the development of European thought and has had a significant influence on such key thinkers as Proust, Bergson, Heidegger, Merleau-Ponty, Derrida, and Deleuze. This edition makes this remarkable and hugely important work available to an English-speaking audience for the first time. Clare Carlisle and Mark Sinclair provide a comprehensive introduction to Ravaissons life, works and enduring influence that clearly situates Ravaissons text within the European philosophical tradition. The translation also includes a thorough commentary on the text that illuminates its arguments and its context.