  Other interpreters — the more cognitivist ones — see the paragraph about ‘is’ and ‘ought’ as doing none of the above. Some read it as simply providing further support for Hume’s extensive argument that moral properties are not discernible by demonstrative reason, leaving open whether ethical evaluations may be conclusions of cogent probable arguments. Others interpret it as making a point about the original discovery of virtue and vice, which must involve the use of sentiment. On this view, one cannot make the initial discovery of moral properties by inference from nonmoral premises using reason alone; rather, one requires some input from sentiment. It is not simply by reasoning from the abstract and causal relations one has discovered that one comes to have the ideas of virtue and vice; one must respond to such information with feelings of approval and disapproval.  Note that on this reading it is compatible with the is/ought paragraph that once a person has the moral concepts as the result of prior experience of the moral sentiments, he or she may reach some particular moral conclusions by inference from causal, factual premises (stated in terms of ‘is’) about the effects of character traits on the sentiments of observers. They point out that Hume himself makes such inferences frequently in his writings.