Wolfe, C.T. and Shank, J.B. (2019) ‘Denis Diderot’, Stanford Encyclopedia of Philosophy.

Denis Diderot occupies a singular position within the French Enlightenment because his philosophy refuses confinement within the conventional borders of philosophical system, literary invention, scientific speculation and political critique. Rather than producing a closed doctrine, he developed a mobile and experimental form of philosophie, in which theatre, fiction, art criticism, encyclopaedic writing and metaphysics became mutually reinforcing modes of inquiry. His central achievement, the Encyclopédie, was not merely a compendium of knowledge but an intellectual machine designed to “change the common way of thinking”, challenging religious authority, inherited hierarchy and the separation between manual craft and theoretical reason. Diderot’s thought radicalised empiricism by treating sensation not simply as a source of knowledge, but as a condition through which worlds are formed; blindness, deafness and touch therefore become philosophical instruments for rethinking perception itself. His materialism is equally distinctive: matter is not inert mechanism, but living, sensitive and transformative substance, capable of generating consciousness, embodiment and social complexity. This philosophy culminates in an anthropology of human beings as historical, bodily and imaginative creatures, shaped by language, institutions and desire. As a case study, Diderot’s unpublished dialogues, especially Le Rêve de D’Alembert and Le Neveu de Rameau, reveal how literary form could carry philosophical force more subtly than systematic treatise. His legacy lies precisely in this danger: he made thought porous, embodied and insurgent. Diderot thus remains indispensable because he transformed Enlightenment reason from abstract doctrine into a restless practice of intellectual liberation.