Enlightenment · materialism · Encyclopédie · 1713–1784

Denis Diderot

Gather knowledge to change the common way of thinking.

Langres · Paris · St Petersburg
Philosophy

Ideas that shift your perspective.

01

Sensitive matter

Sensibility is treated as a general property of matter, inert in a stone and active in an animal; thought then arises from organized living matter, without any immaterial soul being needed to explain it.

A situation to think through

In the conversation that opens D’Alembert’s Dream, a marble statue ground to powder, mixed with humus and eaten as plants becomes, in principle, sensitive flesh.

02

Cross-references

The Encyclopédie presents knowledge as a connected whole in which articles send the reader to one another; these links reveal unexpected relations and can quietly overturn prejudices that no one dared attack openly.

A situation to think through

A deferential article on a religious subject can send the reader, by a cross-reference, to another entry that undermines it.

03

Three codes

The Supplement to Bougainville’s Voyage contrasts the code of nature, the civil code and the religious code; misery and hypocrisy grow when laws forbid what nature permits and contradict one another.

A situation to think through

Orou, a Tahitian, asks a ship’s chaplain why a vow of chastity should forbid what harms no one and gives life.

04

Paradox of the actor

The great actor does not feel what he portrays: cool judgment and close observation let him reproduce, night after night, signs of emotion that move the audience more surely than real tears.

A situation to think through

An actor and his wife who detested each other played a lovers’ scene from Molière while trading insults under their breath, and the audience applauded.

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