The Marschallin de Broglie, a devout Catholic, and the faithless philosopher Crudeli engage in a conversation about the meaning of religion. What is worth sacrificing in this life for a possible reward in heaven? What would change if one abandoned faith? Denis Diderot's light-hearted rogue play fortunately does not provide an answer but lightly yet profoundly explores the terrain; the Enlightenment doubt is irreversibly sown. Denis Diderot (1713-1784) could only publish this cheerful-serious conversation under a pseudonym, as he feared the political explosive power of the Enlightenment rogue play in the Ancien Régime. In the translation by Hans Magnus Enzensberger, it appears here for the first time in German.