This article investigates why Hegel contrasts doubt and ancient scepticism in his 1802 essay, and shows how original this view is. The article shows that this separation rests on ascribing a certainty in the act of negating to the sceptic; this can be seen, first, in Hegel’s interpretation of the relationship between Pyrrhonism and the New Academy and, second, in his reading of Plato’s Parmenides.