The eighteenth-century philosophical defenders of natural rights sometimes suggest that the assertions which state that men possess them are self-evident truths; but we know that there are no self-evident truths. Twentieth-century moral philosophers have sometimes appealed to their and our intuitions; but one of the things that we ought to have learned from the history of moral philosophy is that the introduction of the word ‘intuition’ by a moral philosopher is always a signal that something has gone badly wrong with an argument.
