  Moore's argument had a tremendous impact, striking most people at the time as decisive. As a result, non-naturalism got a new lease on life with a number of people working in metaethics trying to articulate, systematize, and defend accounts of morality that resisted the temptation to identify moral properties with natural  properties.[7]   Much of the attention was given, by those who have come to be called intuitionists, to defending the idea that moral knowledge, while not based on our senses and on the empirical data we might collect, was nonetheless on as secure a footing as, say, our knowledge of mathematics or of the fundamental concepts (of, say, causation and necessity) that play crucial roles in science. Much of the work in metaethics pursued a strategy of finding companions in guilt, of showing that the status of moral properties as non-natural and the attendant implications for what we must suppose about the nature of moral evidence, if we are to take ourselves as having any, did not leave morality any worse off than other respected fields of knowledge.