Rameau's Nephew

A real person Diderot knew, the nephew of the composer Jean-Philippe Rameau: a failed musician, hanger-on and shameless sponger who lived off the tables of the rich. In the dialogue he is the brilliant, disreputable foil to a level-headed philosopher. Diderot uses him to voice everything a respectable Enlightenment thinker was supposed to reject, and makes him far too clever to dismiss.

That flattery, greed and self-abasement are simply how a poor man survives among the wealthy, and that the moralist's virtues are luxuries of the comfortable. Everyone performs for their supper, he insists, so his only difference is honesty about it. The case is witty and frank enough that the philosopher cannot cleanly refute it, and the reader is left unsure the honest man has won.

By an extraordinary route. Diderot never printed it, and at his death in 1784 it existed only in manuscript. A copy reached Germany, where it first appeared in Goethe's German translation of 1805; the French text returned by being translated back from the German, a corrupt 1821 version doubly removed from the original. Diderot's own autograph manuscript was not found until around 1890, in a Paris bookstall.

Because the nephew embodied something Hegel wanted to name: a divided, self-conscious spirit that has seen through every value and lives in pure performance. Hegel quoted the book in the Phenomenology of Spirit as a figure of the disintegrated consciousness of a corrupt culture. Through that borrowing, a dialogue its author never published entered the central line of German philosophy.

Because it was too unsettling to let go. He wrote and rewrote it across more than a decade and kept it to himself, the one book he was least willing to release. Its danger is not a doctrine but an unresolved provocation: it lets a cynic's honesty stand against an honest man's decency without deciding between them, and Diderot seems to have been unwilling to publish something he could not himself resolve.