The fifth edition of Michael L. Morgan's Classics of Moral and Political Theory broadens the scope and increases the versatility of this landmark anthology by offering new selections from Aristotle's Politics , Aquinas' Disputed Questions on Virtue and Treatise on Law , as well as the entirety of Locke's Letter Concerning Toleration , Kant's To Perpetual Peace , and Nietzsche's On the Advantage and Disadvantage of History for Life .