Narveson concludes with a rationally forceful proof of the Principle of Utility. In the course of this argument, which draws on the most widely accepted recent findings in analytical ethics, Narveson discovers an essential identity between the ethical outlooks of Kant and of Mill, which are traditionally held to be antithetical. Both thinkers, he shows, center on the principle that the interests of others are to be regarded as equal in value to one's own. A new view of Mill's celebrated "proof of utilitarianism" is developed in the course of the discussion.