Hume opens his book III of A Treatise of Human Nature with the premise that moral distinctions are not derived from reason. According to Hume we must turn our reflection into ‘our own breast’. J L Mackie, one of the scholars of the philosophy of David Hume criticizes this premise in the following words: “it is riddled with ambiguities: i.e. it is not clear what he means by reason when he says that moral distinctions are not derived from reason and it is also not clear how to interpret moral sense or to understand how moral distinctions are due to it”
