Skepticism and the Basis of Morality

Part One (Skepticism) is devoted to an analysis of ethical skepticism - the idea that morality has no rational basis - and culminates in an account of what must be proved to refute it.
Part Two (The Basis of Morality) develops the methodology for its refutation and then proceeds to its actual refutation, which consists of the proof and elucidation of the rational basis of morality: the one and only true, or correct, supreme principle of all morality.