John Gay, the English moral philosopher, was a fellow of Sidney Sussex College, Cambridge, and later vicar of Wilshampstead, Bedfordshire. His short "Dissertation concerning the Fundamental Principle of Virtue or Morality" was first published as a preface to Edmund Law's translation of William King's Latin Essay on the Origin of Evil (1731). (Law was bishop of Carlisle and King was archbishop of Dublin.) The "Dissertation" is one of the seminal works in the history of English utilitarianism. In the eighteenth century its influence may be found in the works of the theological utilitarians, Abraham Tucker (The Light of Nature Pursued, 7 vols., 1768–1778) and William Paley (Principles of Moral and Political Philosophy, 1785). David Hartley said that Gay's assertion of the importance of psychological association in human nature was the origin of his Observations on Man (1749).

Gay hoped to eradicate confusion in moral philosophy and to harmonize the...