Example image of eyePlorer eyePlorer map for 'An Enquiry Concerning the Principles of Morals': David Hume An Enquiry concerning Human Understanding A Treatise of Human Nature Moral psychology Moral rationalism Moral sense theory Meta-ethics Ethical intuitionism Anti-realism J. L. Mackie Philosophical realism Adam Smith Empathy Francis Hutcheson Psychological egoism Thomas Hobbes Normative ethics Virtue ethics 1751 in Great Britain Emotivism Four Dissertations EPM