Toleration is becoming an increasingly questioned issue in modern democratic and multicultural societies and is debated within the academic disciplines of politics, history, and cultural and literary studies. In this book, Glen Newey systematically analyses toleration in relation to broader issues in meta-ethical theory and offers a new, rigorous philosophical theory of toleration as a virtue. A wide range of questions in ethical theory are addressed, including ethical responsibility, character and critue, the nature of reasons for action, the acts/omissions doctrine, and the nature of normativity itself. This analysis offers a new understanding of the limits of moral theory, and reveals problems with understanding toleration philosophically and with implementing it politically. As a unique contribution to the toleration debate, this book will be of importance to all those with an interest in political theory, philosophy and ethics.