"An Enquiry Concerning the Principles of Morals" by David Hume argues that the foundations of morals lie with sentiment, not reason. Hume's approach is largely an empirical one. Instead of beginning his moral inquiry with questions of how morality ought to operate, he purports to investigate primarily how we actually do make moral judgments. Hume purports to provide a naturalistic account of morality, at least to the extent that it is something that is common among the human species.
