We talk a bit more about David Hume's An Enquiry Concerning the Principles of Morals (1751), and add some parts of A Treatise of Human Nature (1739): sec. 3 "Of the Influencing Motives of the Will" within the third part of Book II, "Of the Passions," and the first two sections of Book III, "Of Morals."

Can reason by itself motivate moral action? Hume says no: All ethical reasons must point ultimately to sentiments, which we can generalize about, but which are epistemically basic.

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