On Denis Diderot's Rameau's Nephew, a dialogue written in the 1760s. Is virtue necessary for happiness, or in the real world, is vice necessary to get by? Diderot's character Rameau argues the latter: that philosophical morality is problematic, and our imperative is prudence, which in Rameau's case involves a lot of clownish deception and (ironically) truth-telling.

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