The Ideal of a Rational Morality collects the most important important essays by the distinguished moral philosopher Marcus G. Singer. Its guiding ambition is to find an ideal for improving ordinary morality and moral judgements by using reason, mounting compelling arguments against scepticism, relativism, prejudice, and racism. Singer's is a rigorous and inspiring defence of proof and truth in morality, emphasizing the importance of common sense and the soundness of the 'Golden Rule': treat others as you would wish to be treated yourself.