  Nevertheless, while naturalized epistemology and moral naturalism are logically distinct, it is arguable that anyone who subscribes to naturalized epistemology and believes that moral knowledge is possible should be a moral naturalist. For if moral knowledge is part of knowledge and all knowledge is to be explained within science, then moral knowledge itself must be explainable within science, and that would be possible, it would seem, only if moral properties were natural properties that we learn to identify empirically. There exist, however, several major problems for anyone who endorses both moral naturalism and naturalized epistemology, at least in the radical form advocated by Quine. The reason is that the strategies that seem promising for addressing standard objections to naturalized epistemology are in tension with the possibility of moral knowledge. Consideration of two standard objections shows how strategies for coping with them can lead to difficulty.