What makes something good or evil? What makes an action right or wrong? Explore competing answers from both classical and Christian perspectives. Morality and Immorality is a carefully edited anthology of the most influential primary sources in the history of moral philosophy and ethical reflection. Organized by major moral theories - from relativism and egoism to utilitarianism, deontology, natural law, and divine command theory - this volume includes seminal reflections on the nature of morality from such towering figures as Plato, Aristotle, Hobbes, Kant, Mill, and W.D. Ross. Additionally, the volume highlights key contributions to moral theorizing from important Christian thinkers, including Augustine, Evagrius, Aquinas, Ockham, Calvin, C.S. Lewis, and Alasdair McIntyre, alongside key biblical and Christian texts like the Holiness Code, the Sermon on the Mount, and the Didache. Each reading is concisely introduced by the editor, providing context and thematic guidance. Ideal for undergraduate students, this volume brings together a comprehensive range of sources for moral inquiry - ancient, modern, secular, and sacred.