 Ultimate values are not matters as to which argument is possible. If a man maintains that misery is desirable and that it would be a good thing if everybody always had a violent toothache, we may disagree with him, and we may laugh at him if we catch him going to the dentist, but we cannot prove that he is mistaken as we could if he said that iron is lighter than water … As to ultimate values, men may agree or disagree, they may fight with guns or with ballot papers but they cannot reason logically. (Education and the Social Order: 136)