An Enquiry Concerning the Principles of Morals — David Hume

Shortly before his death, David Hume declared his Enquiry concerning the Principles of Morals (1751) to be the best of his many writings. In this highly influential work, Hume sets out his theory of justice and benevolence and the other virtues, and argues that morality is
founded on the natural feelings or sentiments of humankind.