is-ought dichotomy

Is-Ought: A Semantic Solution

David Hume is famous for the “is-ought” problem, which comes from this famous passage, in his “Treatise on Human Nature”: In every system of morality, which I have hitherto met with, 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 surprised 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.