  In the moral Enquiry Hume omits all arguments to show that reason alone does not move us to act; so the Representation Argument about the irrelevance of reason to passions and actions is absent. Without it he has no support for his direct argument that moral goodness and evil are not identical with reasonableness and unreasonableness, which relies on it for its key premise; and that too is absent from EPM. On the whole in EPM Hume does not appeal to the thesis that reason cannot produce motives in order to show that morals are not derived from reason alone, but limits himself to the epistemic and descriptive arguments showing that reason alone cannot discern virtue and vice in order to reject ethical rationalism in favor of sentimentalism.  However, at Appendix I.21 he does assert (without support) that “Reason, being cool and disengaged, is no motive to action,” and perhaps this is intended to be a premise in a revised version of the famous argument that reason cannot produce motives but morals can, though what he writes here is tantalizingly different from that argument as it appears repeatedly in the Treatise.