As I observed in yesterday's entry, Mauser's project commits him to refuting an Humean argument. Yesterday I gave that argument in Mauser's paraphrase. Today I'll give it in Hume's own words. "In every system of morality, which I have hitherto met with," Hume wrote, "I have always remarked, that the author proceeds for some time in the ordinary way of reasoning, and establishes the being of a God, or makes observations concerning human affairs; when of a sudden I am surprized to find, that instead of the usual copulations of propositions, is, and is not, I meet with no proposition that is not connected with an ought, or an ought not. This change is imperceptible; but is, however, of the last consequence. For as this ought, or ought not, expresses some new relation or affirmation, it is necessary that it should be observed and explained; and at the same time that a reason should be given, for what seems altogether inconceivable, how this new relat...