Hume's “Is‐Ought” Problem: a solution

Abstract

David Hume first raised the “is-ought” problem in this famous passage from A Treatise of Human Nature:I cannot forbear adding to these reasonings an observation which may, perhaps, be found of some importance. In every system of morality, which I have hitherto met with, I have always remark’d, 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 surpriz’d 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 ‘tis necessary that it shou’d be observ’d and explain’d, and at the same time that a reason should be given for what seems altogether inconceivable, how this new relation can be a deduction from others, which are entirely different from it. But as authors do not commonly use this precaution, I shall presume to recommend it to the readers; and am persuaded, that this small attention wou’d subvert all the vulgar system of morality, and let us see, that the distinction of vice and virtue is not founded on the relations of objects, nor is perceived by reason.Behind Hume’s quietly persuasive comments lie at least two questionable assumptions. The first is that the way language is ordinarily used is wrong; rather than take note, in an empirical fashion, of how moral discourse is normally conducted, Hume chooses to be negatively prescriptive in respect of “all the vulgar system of morality”.