Renaissance English casuistry, the branch of moral philosophy that applies general principles to particular cases, supplies a significant context for Milton’s Samson Agonistes. In subject matter, structure, and language, Milton’s tragedy resembles the prose cases of conscience in which casuists showed how to overcome doubt and despair and gain peaceful consciences by resolving difficult moral problems. Such casuistical concepts as the supremacy of the individual conscience, the relevance of circumstances to moral law, and the role of reason in resolving doubt illuminate the conflicting moral judgments that form the dramatic texture of Samson Agonistes. Samson learns how to judge his own actions in particular circumstances, and by doing so, learns to repent of his past sin, overcome his sense of powerlessness, and act with a clear conscience. The drama goes beyond conventional casuistry in its uncompromising assertion of the supremacy of the individual conscience and its unflinching recognition of the tragic limits of human power.