The word utiliarianism was coined by Jeremy Bentham in 1781 in a letter to friend in which he said: "A new religion would be an odd sort of thing without a name." While the doctrine never quite became a religion, its thesis, as expressed by Mill in the first essay in this volume-that the good and right are to be defined as that which promotes happiness-became the dominant naturalistic theory of the nineteenth century and provided the moral basis for classical liberalism.