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?

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.

Often considered the foundation of political liberalism, John Locke's Two Treatises of Government was first published anonymously in 1689, in the wake of England's Glorious Revolution. In The First Treatise of Government, Locke refutes the idea of divine monarchy, while The Second Treatise of Government articulates Locke's philosophy of government, which he based upon his theories of natural rights and the social contract.

In The Republic, Socrates is asked the question: "What is justice?" And in order to answer it, he draws a long and detailed analogy between the individual and the city. Plato’s work forms the foundation of Western philosophy and covers a wide range of topics including political theory and ethics, with extended digressions into artistic and literary criticism, the theory and practice of education as well as epistemology and metaphysics.

Immanuel Kant’s Critique of Pure Reason is a core text of modern philosophy. Presenting an examination of the nature of human reason, its central argument is that the way in which man perceives his environment is a direct consequence of the mind’s ability to act on this environment and convert it into something meaningful. The work brings together two opposing schools of philosophy—rationalism and empiricism—and proposes a third way, which came to be known as transcendental idealism. The work proved to be hugely influential, not least on Marx, Heidegger and Nietzsche.

World politics is entering a new phase, in which the great divisions among humankind and the dominating source of international conflict will be cultural.

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.

古代中国の書『老子（老子道徳経）』は，熾烈な戦国時代を生き抜く処世の知恵であり一種の統治理論であるが，同時に，世の中と人間についての深い洞察力によって，人類の教科書ともいうべき普遍性を持っている．

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.

「人よく菜根を咬みえば、則ち百事なすべし」。菜根は堅くて筋が多い、これをかみしめてこそものの真の味わいがわかる。