  Anthony Ashley Cooper, the 3rd Earl of Shaftesbury (1671–1713) is generally thought to have been the one of the earliest ‘moral sense’ theorists, holding that we possess a kind of “inner eye” that allows us to make moral discriminations. This seems to have been an innate sense of right and wrong, or moral beauty and deformity. Again, aspects of this doctrine would be picked up by Francis Hutcheson and David Hume (1711–1776). Hume, of course, would clearly reject any robust realist implications. If the moral sense is like the other perceptual senses and enables us to pick up on properties out there in the universe around us, properties that exist independent from our perception of them, that are objective, then Hume clearly was not a moral sense theorist in this regard. But perception picks up on features of our environment that one could regard as having a contingent quality. There is one famous passage where Hume likens moral discrimination to the perception of secondary qualities, such as color. In modern terminology, these are response-dependent properties, and lack objectivity in the sense that they do not exist independent of our responses. This is radical. If an act is vicious, its viciousness is a matter of the human response (given a corrected perspective) to the act (or its perceived effects) and thus has a kind of contingency that seems unsettling, certainly unsettling to those who opted for the theological option.