 The best known parts of Leibniz’s interaction with Hobbes are from early in Leibniz’s philosophical career, before 1686, the year in which Leibniz wrote his ‘Discourse on Metaphysics’ (Bernstein 1980; Jesseph 1998; Moll 1996, 103–36; Wilson 1997). His criticism of Hobbes’s nominalism, and his early adoption of the view that reasoning is computation, were both discussed above. Leibniz also paid a good deal of attention to Hobbes’s views about motion, in particular those about conatus or endeavour, which have application both to physics and to mathematics. And Leibniz twice in the 1670s wrote letters to Hobbes, though it is unclear if Hobbes ever received them, and there is no evidence of any replies. Leibniz continued, moreover, to engage with Hobbes’s work throughout his philosophical career, even if that engagement was never quite as intense as it was in a brief early period. There is, for instance, a discussion of Hobbes’s views in the 1709 Theodicy.