For example, Aristotle implies that less precise knowledge is possible in ethics than in other spheres of inquiry, and considers ethical knowledge as dependent on habit and acculturation in a way that distinguishes it from other types of knowledge. Metaethics is also important in GE Moore's Principia Ethica of 1903. In it he wrote for the first time what he called the naturalistic fallacy. Moore was seen to reject naturalism in ethics, in his open question argument. This has pushed thinkers to reconsider second-order questions about ethics. Previously, the Scottish philosopher David Hume had put forward a similar view on the difference between facts and