 In response to libertarians’ claim that self-determination requires that the agent, rather than his motives, cause his actions, it was objected that this removes the agent from the natural causal order, which is clearly unintelligible for human animals (Hobbes 1654 [1999], 38). It is important to recognize that an implication of the second step of the strategy is that free will is not only compatible with determinism but actually requires determinism (cf. Hume 1748 [1975] VIII). This was a widely shared assumption among compatibilists up through the mid-twentieth century.