Approaches to the concept of trust in philosophy are extremely diverse and developing rapidly. At present, questions about trust are treated within several philosophical traditions, from Hobbesian political theory to Wittgensteinian epistemology and Levinasian ethics to Protestant theology. Some see trust as a form of risk management, essential for understanding modern politics and economics, while others would claim that a recognisably human life is only possible against the background of a basic trust. This book brings together these theoretical strands in a comprehensive overview. Olli Lagerspetz breathes new life into the philosophical debate on trust by showing how questions about trust are at the centre of any in-depth analyses of the nature of human agency and human rationality and that these issues, in turn, lie at the heart of philosophical ethics. Ideal for those grappling with these issues for the first time, Trust, Ethics and Human Reason provides a thorough and impassioned assessment of the concept of trust in moral philosophy.