Groundwork of the Metaphysics of Morals (1785) is the first of Immanuel Kant's mature works on moral philosophy and remains one of the most important in the field. Kant examines the core concepts and principles of moral theory, showing that they are normative for rational agents. He aspires to lay bare the fundamental principle of morality and prove that it applies to us. Kant offers the argument that the rightness of an action is determined by the character of the principle that a person chooses to act upon. 

A landmark of Enlightenment thought, Hume's An Enquiry Concerning Human Understanding is accompanied here by two shorter works that shed light on it: A Letter from a Gentleman to His Friend in Edinburgh, Hume's response to those accusing him of atheism, of advocating extreme skepticism, and of undermining the foundations of morality; and his Abstract of A Treatise of Human Nature, which anticipates discussions developed in the Enquiry.

This very short introduction offers listeners a superb overview of the teachings of the Buddha, as well as a succinct guide to the integration of Buddhism into daily life.  

Long regarded as the most accurate rendering of Plato's Republic that has yet been published, this widely acclaimed translation by Allan Bloom was the first to take a strictly literal approach. In addition to the annotated text, there is also a rich and valuable essay—as well as indices—which will enable listeners to better understand the heart of Plato's intention.

First published in response to John Rawls' A Theory of Justice, Robert Nozick's Anarchy, State, and Utopia has since become one of the defining texts in classic libertarian thought. Challenging and ultimately rejecting liberal, socialist, and conservative agendas, Nozick boldly asserts that the rights of individuals are violated as a state's responsibilities increase—and the only way to avoid these violations rests in the creation of a minimalist state limited to protection against force, fraud, theft, and the enforcement of contracts.