Aristotle's most complicated and academic work. This is a challenging work for even those who admire his other seven books. Incomparable analysis in language and thought, with a clear, succinct prose touch.

Rousseau's Social Contract remains, after a quarter of a millennium, one of the most controversial texts in the history of political philosophy, variously seen as a model for participatory democracy, a blueprint for totalitarianism, and several points in between. In addition to Rousseau’s magnum opus, this production includes an introduction by George Douglas Howard Cole, an English political theorist, economist, writer and historian. Also included are three discourses that Rousseau composed apart from The Social Contract.

Two years before he died, St. Thomas Aquinas, probably the greatest teacher the Church has ever known, was asked by his assistant Brother Reginald to write a simple summary of the faith of the Catholic Church for those who lacked the time or the stamina to tackle his massive Summa Theologica. In response, the great saint quickly set down in language that non-scholars can understand his peerless insights into the major topics of theology: the Trinity, Divine Providence, the Incarnation of Christ, the Last Judgment, and much more.

Born out of the political turmoil of the English Civil War, Leviathan stands out as one of the most in influential political and philosophical texts of the 17th century. It argues for the restoration of the monarchy in light of the republic and calls for a commonwealth ruled by an authoritative, autocratic figure with absolute sovereignty. This would put an end to all controversy, war, and fear and establish peace via social contract.

As intriguing today as when it was first published, Hume's An Enquiry Concerning Human Understanding is a fascinating exploration into the nature of human knowledge. Using billiard balls, candles, and other colorful examples, Hume conveys the core of his empiricism - that true knowledge can be gained only through sensory experience.

After more than 2,300 years, the Greek philosopher Aristotle still remains one of the most influential thinkers who has ever lived. There was hardly any field of human knowledge in existence during his day in which he did not make a major contribution. Additionally, he probed areas which were never before examined. Indeed, one could make the claim that no individual person has ever known as much about this world as Aristotle. His analyses of zoology and logic paved the way for modern forensic techniques, and for which every scientist down to this day owes him a debt of gratitude.

A caustic criticism of nearly every philosophic predecessor and a challenge of traditionally held views on right and wrong, Friedrich Nietzsche’s Beyond Good and Evil paved the way for modern philosophical thought. Through nearly three hundred transformative aphorisms, Nietzsche presents a worldview in which neither truth nor morality are absolutes, and where good and evil are not opposites but counterparts that stem from the same desires.

Published in 1748, An Enquiry Concerning Human Understanding is Scottish empiricist philosopher David Hume's distillation of his mature philosophy. Addressing themes including the limits of human understanding, the compatibility of free will with determinism, weaknesses in the foundations of religion, and the appeal of skepticism, An Enquiry Concerning Human Understanding is Hume's attempt to revise and clarify the ideas of his earlier A Treatise of Human Nature.

Benedict de Spinoza's Ethics, first published in 1677, constitutes a major systematic critique of the traditional and religious foundations of philosophical thought. In it, Spinoza follows a logical step-by-step format consisting of definitions, axioms, propositions, proofs, and corollaries to create a comprehensive inquiry into the truth about God, nature, and humans' place within the universe. From these broad metaphysical themes, Spinoza derives what he considered to be the highest principles of religion and society and lays out an ethical system in which reason is the supreme value.

The Republic poses questions that endure: What is justice? What form of community fosters the best possible life for human beings? What is the nature and destiny of the soul? What form of education provides the best leaders for a good republic? What are the various forms of poetry and the other arts, and which ones should be fostered and which ones should be discouraged? How does knowing differ from believing?

What is life? What is my place in it? What choices do these questions obligate me to make? More than a half-century after it burst upon the intellectual scene - with roots that extend to the mid-19th century - Existentialism's quest to answer these most fundamental questions of individual responsibility, morality, and personal freedom, life has continued to exert a profound attraction.

This is an essay from the Favorite Essays collection.

Aristotle's Nicomachean Ethics, said to be dedicated to Aristotle's son, Nicomachus, is widely regarded as one of the most important works in the history of Western philosophy. Addressing the question of how men should best live, Aristotle's treatise is not a mere philosophical meditation on the subject, but a practical examination that aims to provide a guide for living out its recommendations.

The Fable of the Bees—a satirical poem, prose discussion, three essays and six dialogues completed in 1729—exposes human vices but defends them as a necessity within a wealthy society. Mandeville’s bees thrive until they start living by honesty and virtue… then they are impoverished. Mandeville did not play by the rules: he satirized the sins of society but also ridiculed the widespread hypocrisy of deploring these sins whilst reaping their benefits. He and his work were attacked for the rest of the century.

Rene Descartes is often described as the first modern philosopher, but much of the content of his Meditations on First Philosophy can be found in the medieval period that had already existed for more than a thousand years. Does God exist? If so, what is his nature? Is the human soul immortal? How does it differ from the body? What role do sense experience and pure reason play in knowing?

A Letter Concerning Toleration by John Locke was originally published in Latin in 1689. It was Locke's response to the problem of religion and government; he proposed religious toleration as the answer. For Locke, the only way a church gains genuine converts is through persuasion, not violence. Arguing that the government should not involve itself in spiritual matters, he offers three main reasons.

The Prince is a treatise that systematically charts the best strategies for successful governing. It unapologetically places realism above idealism, showing would-be kings how to get what they want while appearing to be generous and honourable, and advocates that the means — cruelty, duplicity and horror —justify the ends of secure monarchical rule. But it can also be read as the work of a secret republican subtly undermining the despotism of the ruling Medici family.

Composed in four parts between 1883 and 1885, Thus Spoke Zarathustra is the most famous and influential work of German philosopher Friedrich Nietzsche. The work is a philosophical novel in which the character of Zarathustra, a religious prophet-like figure, delivers a series of lessons and sermons in a Biblical style that articulate the central ideas of Nietzsche's mature thought.

Epigenetics is the science of living DNA, charting the chemical pathways that spur DNA into action by turning genes on and off. While the Human Genome Project of the early 2000s was hailed as the key to understanding human heredity and disease, that historic effort was just the beginning. It has taken epigenetics to fill in the picture, explaining how the fixed code of our genome is implemented in countless living processes.

Socrates is in prison, sentenced to die when the sun sets. In this final conversation, he asks what will become of him once he drinks the poison prescribed for his execution. Socrates and his friends examine several arguments designed to prove that the soul is immortal. This quest leads him to the broader topic of the nature of mind and its connection not only to human existence but also to the cosmos itself. What could be a better way to pass the time between now and the sunset?