introduction to philosophy

Born at Stagira in northern Greece, Aristotle was the most notable product of the educational program devised by Plato; he spent twenty years of his life studying at the Academy. When Plato died, Aristotle returned to his native Macedonia, where he is supposed to have participated in the education of Philip's son, Alexander (the Great). He came back to Athens with Alexander's approval in 335 and established his own school at the Lyceum, spending most of the rest of his life engaged there in research, teaching, and writing. His students acquired the name "peripatetics" from the master's habit of strolling about as he taught. Although the surviving works of Aristotle probably represent only a fragment of the whole, they include his investigations of an amazing range of subjects, from logic, philosophy, and ethics to physics, biology, psychology, politics, and rhetoric. Aristotle appears to have thought through his views as he wrote, returning to significant issues at different stages of his own development. The result is less a consistent system of thought than a complex record of Aristotle's thinking about many significant issues.

Although Aristotle's achievements in logic, metaphysics, and natural science are significant, he is perhaps best remembered for his several efforts to explain how moral conduct contributes to the good life for human agents, including the Εθικη Ευδαιμονης (Eudemian Ethics) and the Magna Moralia, but the most complete surviving statement of his views on morality occurs in the Εθικη Νικομαχοι (Nicomachean Ethics). There he considered the natural desire to achieve happiness, described the operation of human volition and moral deliberation, developed a theory of each virtue as the mean between vicious extremes, discussed the value of three kinds of friendship, and defended his conception of an ideal life of intellectual pursuit.

But on Aristotle's view, the lives of individual human beings are invariably linked together in a social context. In the Περι Πολις (Politics) he speculated about the origins of the state, described and assessed the relative merits of various types of government, and listed the obligations of the individual citizen. He may also have been the author of a model Πολιτειας Αθηναων (Constitution of Athens), in which the abstract notion of constitutional government is applied to the concrete life of a particular society.

Excerpt from Philosophy Pages

Immanuel Kant was born in the East Prussian city of Königsberg, studied at its university, and worked there as a tutor and professor for more than forty years, never travelling more than fifty miles from home. Although his outward life was one of legendary calm and regularity, Kant's intellectual work easily justified his own claim to have effected a Copernican revolution in philosophy. Beginning with his Inaugural Dissertation (1770) on the difference between right- and left-handed spatial orientations, Kant patiently worked out the most comprehensive and influential philosophical programme of the modern era. His central thesis—that the possibility of human knowledge presupposes the active participation of the human mind—is deceptively simple, but the details of its application are notoriously complex.

The monumental Kritik der reinen Vernunft (Critique of Pure Reason) (1781, 1787) Kant fully spells out the conditions for mathematical, scientific, and metaphysical knowledge in its "Transcendental Aesthetic," "Transcendental Analytic," and "Transcendental Dialectic," but Kant found it helpful to offer a less technical exposition of the same themes in the Prolegomena zu einer jeden künftigen Metaphysik die als Wissenschaft wird auftreten können (Prolegomena to any Future Metaphysic) (1783). Carefully distinguishing judgments as analytic or synthetic and as a priori or a posteriori, Kant held that the most interesting and useful varieties of human knowledge rely upon synthetic a priori judgments, which are, in turn, possible only when the mind determines the conditions of its own experience. 

Kant's moral philosophy is developed in the Grundlegung zur Metaphysik der Sitten (Grounding for the Metaphysics of Morals) (1785). From his analysis of the operation of the human will, Kant derived the necessity of a perfectly universalizable moral law, expressed in a categorical imperative that must be regarded as binding upon every agent. In the Third Section of the Grounding and in the Kritik der practischen Vernunft (Critique of Practical Reason) (1788), Kant grounded this conception of moral autonomy upon our postulation of god, freedom, and immortality.

In later life, Kant drew art and science together under the concept of purpose in the Kritik der Urteilskraft (Critique of Judgment) (1790), considered the consequences of transcendental criticism for theology in Die Religion innerhalb die Grenzen der blossen Vernunft (Religion within the Limits of Reason Alone) (1793), stated the fundamental principles for civil discourse in Beantwortung der Frage: Was ist Aufklärung? ("What is Enlightenment?" (1784), and made an eloquent plea for international cooperation in Zum ewigen Frieden (Perpetual Peace) (1795).

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