Aristotle, Greek Aristoteles, (born 384 BCE, Stagira, Chalcidice, Greece—died 322, Chalcis, Euboea), ancient Greek philosopher and scientist, one of the greatest intellectual figures of Western history. He was the author of a philosophical and scientific system that became the framework and vehicle for both Christian Scholasticism and medieval Islamic philosophy. Even after the intellectual revolutions of the Renaissance, the Reformation, and the Enlightenment, Aristotelian concepts remained embedded in Western thinking.

Life

The Academy

Aristotle was born on the Chalcidic peninsula of Macedonia, in northern Greece. His father, Nicomachus, was the physician of Amyntas III (reigned c. 393–c. 370 BCE), king of Macedonia and grandfather of Alexander the Great (reigned 336–323 BCE). After his father’s death in 367, Aristotle migrated to Athens, where he joined the Academy of Plato (c. 428–c. 348 BCE). He remained there for 20 years as Plato’s pupil and colleague.

Many of Plato’s later dialogues date from these decades, and they may reflect Aristotle’s contributions to philosophical debate at the Academy. Some of Aristotle’s writings also belong to this period, though mostly they survive only in fragments. Like his master, Aristotle wrote initially in dialogue form, and his early ideas show a strong Platonic influence. His dialogue Eudemus, for example, reflects the Platonic view of the soul as imprisoned in the body and as capable of a happier life only when the body has been left behind. According to Aristotle, the dead are more blessed and happier than the living, and to die is to return to one’s real home.

Another youthful work, the Protrepticus (“Exhortation”), has been reconstructed by modern scholars from quotations in various works from late antiquity. Everyone must do philosophy, Aristotle claims, because even arguing against the practice of philosophy is itself a form of philosophizing. The best form of philosophy is the contemplation of the universe of nature; it is for this purpose that God made human beings and gave them a godlike intellect. All else—strength, beauty, power, and honour—is worthless.

Within the Academy, however, relations seem to have remained cordial. Aristotle always acknowledged a great debt to Plato; he took a large part of his philosophical agenda from Plato, and his teaching is more often a modification than a repudiation of Plato’s doctrines. Already, however, Aristotle was beginning to distance himself from Plato’s theory of Forms, or Ideas (eidos; see form). (The word Form, when used to refer to Forms as Plato conceived them, is often capitalized in the scholarly literature; when used to refer to forms as Aristotle conceived them, it is conventionally lowercased.) Plato had held that, in addition to particular things, there exists a suprasensible realm of Forms, which are immutable and everlasting. This realm, he maintained, makes particular things intelligible by accounting for their common natures: a thing is a horse, for example, by virtue of the fact that it shares in, or imitates, the Form of “Horse.” In a lost work, On Ideas, Aristotle maintains that the arguments of Plato’s central dialogues establish only that there are, in addition to particulars, certain common objects of the sciences. In his surviving works as well, Aristotle often takes issue with the theory of Forms, sometimes politely and sometimes contemptuously. In his Metaphysics he argues that the theory fails to solve the problems it was meant to address. It does not confer intelligibility on particulars, because immutable and everlasting Forms cannot explain how particulars come into existence and undergo change. All the theory does, according to Aristotle, is introduce new entities equal in number to the entities to be explained—as if one could solve a problem by doubling it. 

The Lyceum of Aristotle:

While Alexander was conquering Asia, Aristotle, now 50 years old, was in Athens. Just outside the city boundary, he established his own school in a gymnasium known as the Lyceum. He built a substantial library and gathered around him a group of brilliant research students, called “peripatetics” from the name of the cloister (peripatos) in which they walked and held their discussions. The Lyceum was not a private club like the Academy; many of the lectures there were open to the general public and given free of charge.

Most of Aristotle’s surviving works, with the exception of the zoological treatises, probably belong to this second Athenian sojourn. There is no certainty about their chronological order, and indeed it is probable that the main treatises—on physics, metaphysics, psychology, ethics, and politics—were constantly rewritten and updated. Every proposition of Aristotle is fertile of ideas and full of energy, though his prose is commonly neither lucid nor elegant.

Aristotle’s works, though not as polished as Plato’s, are systematic in a way that Plato’s never were. Plato’s dialogues shift constantly from one topic to another, always (from a modern perspective) crossing the boundaries between different philosophical or scientific disciplines. Indeed, there was no such thing as an intellectual discipline until Aristotle invented the notion during his Lyceum period.

Aristotle divided the sciences into three kinds: productive, practical, and theoretical. The productive sciences, naturally enough, are those that have a product. They include not only engineering and architecture, which have products like bridges and houses, but also disciplines such as strategy and rhetoric, where the product is something less concrete, such as victory on the battlefield or in the courts. The practical sciences, most notably ethics and politics, are those that guide behaviour. The theoretical sciences—physics, mathematics, and theology—are those that have no product and no practical goal but in which information and understanding are sought for their own sake.

During Aristotle’s years at the Lyceum, his relationship with his former pupil Alexander apparently cooled. Alexander became more and more megalomaniac, finally proclaiming himself divine and demanding that Greeks prostrate themselves before him in adoration. Opposition to this demand was led by Aristotle’s nephew Callisthenes (c. 360–327 BCE), who had been appointed historian of Alexander’s Asiatic expedition on Aristotle’s recommendation. For his heroism Callisthenes was falsely implicated in a plot and executed.

When Alexander died in 323, democratic Athens became uncomfortable for Macedonians, even those who were anti-imperialist. Saying that he did not wish the city that had executed Socrates “to sin twice against philosophy,” Aristotle fled to Chalcis, where he died the following year. His will, which survives, makes thoughtful provision for a large number of friends and dependents. To Theophrastus (c. 372–c. 287 BCE), his successor as head of the Lyceum, he left his library, including his own writings, which were vast. Aristotle’s surviving works amount to about one million words, though they probably represent only about one-fifth of his total output.

Physics and metaphysics of Aristotle:

Aristotle divided the theoretical sciences into three groups: physics, mathematics, and theology. Physics as he understood it was equivalent to what would now be called “natural philosophy,” or the study of nature (physis); in this sense it encompasses not only the modern field of physics but also biology, chemistry, geology, psychology, and even meteorology. Metaphysics, however, is notably absent from Aristotle’s classification; indeed, he never uses the word, which first appears in the posthumous catalog of his writings as a name for the works listed after the Physics. He does, however, recognize the branch of philosophy now called metaphysics: he calls it “first philosophy” and defines it as the discipline that studies “being as being.”

Aristotle’s contributions to the physical sciences are less impressive than his researches in the life sciences. In works such as On Generation and Corruption and On the Heavens, he presented a world-picture that included many features inherited from his pre-Socratic predecessors. From Empedocles (c. 490–430 BCE) he adopted the view that the universe is ultimately composed of different combinations of the four fundamental elements of earth, water, air, and fire. Each element is characterized by the possession of a unique pair of the four elementary qualities of heat, cold, wetness, and dryness: earth is cold and dry, water is cold and wet, air is hot and wet, and fire is hot and dry. Each element has a natural place in an ordered cosmos, and each has an innate tendency to move toward this natural place. Thus, earthy solids naturally fall, while fire, unless prevented, rises ever higher. Other motions of the elements are possible but are “violent.” (A relic of Aristotle’s distinction is preserved in the modern-day contrast between natural and violent death.)
Aristotle’s vision of the cosmos also owes much to Plato’s dialogue Timaeus. As in that work, the Earth is at the centre of the universe, and around it the Moon, the Sun, and the other planets revolve in a succession of concentric crystalline spheres. The heavenly bodies are not compounds of the four terrestrial elements but are made up of a superior fifth element, or “quintessence.” In addition, the heavenly bodies have souls, or supernatural intellects, which guide them in their travels through the cosmos.

Even the best of Aristotle’s scientific work has now only a historical interest. The abiding value of treatises such as the Physics lies not in their particular scientific assertions but in their philosophical analyses of some of the concepts that pervade the physics of different eras—concepts such as place, time, causation, and determinism.

Legacy

Since the Renaissance it has been traditional to regard the Academy and the Lyceum as two opposite poles of philosophy. Plato is idealistic, utopian, otherworldly; Aristotle is realistic, utilitarian, commonsensical. (This viewpoint is reflected in the famous depiction of Plato and Aristotle in Raphael’s Vatican fresco The School of Athens.) In fact, however, the doctrines that Plato and Aristotle share are more important than those that divide them. Many post-Renaissance historians of ideas have been less perceptive than the commentators of late antiquity, who saw it as their duty to construct a harmonious concord between the two greatest philosophers of the known world.

By any reckoning, Aristotle’s intellectual achievement is stupendous. He was the first genuine scientist in history. He was the first author whose surviving works contain detailed and extensive observations of natural phenomena, and he was the first philosopher to achieve a sound grasp of the relationship between observation and theory in scientific method. He identified the various scientific disciplines and explored their relationships to each other. He was the first professor to organize his lectures into courses and to assign them a place in a syllabus. His Lyceum was the first research institute in which a number of scholars and investigators joined in collaborative inquiry and documentation. Finally, and not least important, he was the first person in history to build up a research library, a systematic collection of works to be used by his colleagues and to be handed on to posterity.

Millennia later, Plato and Aristotle still have a strong claim to being the greatest philosophers who have ever lived. But if their contribution to philosophy is equal, it was Aristotle who made the greater contribution to the intellectual patrimony of the world. Not only every philosopher but also every scientist is in his debt. He deserves the title Dante gave him: “the master of those who know.”