Aristotle

Aristotle was born in 384 BCE at Stagira, a small Greek city on the Chalcidice peninsula in the northern Aegean ^[2][3]. His father, Nicomachus, was court physician to Amyntas III of Macedon, grandfather of Alexander the Great, and the family connection to the Macedonian court would run through the whole of Aristotle's life ^[2][5]. Ancient tradition held that the medical guild of the Asclepiads trained sons in dissection, and whether or not the boy learned anatomy at his father's side, the physician's habit of close observation became the signature of his mind ^[3][5].

Both parents died while he was young, and a guardian, Proxenus of Atarneus, raised him and then made the decision that mattered: in 367 BCE, at seventeen, Aristotle was sent to Athens to enter Plato's Academy, the most demanding school in the Greek world ^[2][3]. He stayed twenty years. Plato is said to have called him "the mind of the school," and later gossip preserved the sharper edge of the relationship; Aristotle would write that Plato was dear to him, but the truth dearer still ^[1][2]. He absorbed the master's method and then systematically dismantled his central doctrine, arguing that the forms of things do not live in a separate heaven of ideas but in the things themselves, in this world, available to eyes and hands ^[3][4].

When Plato died in 347 BCE the Academy passed to his nephew Speusippus, and Aristotle left Athens; anti-Macedonian feeling in the city, rising as Philip II swallowed Greek towns including Stagira itself, may have pushed as hard as disappointment did ^[2][5]. He crossed the Aegean to Assos, on the coast of Asia Minor, at the invitation of Hermias, a former slave turned philosopher-ruler. He married Hermias's niece and adopted daughter, Pythias, with whom he had a daughter of the same name; when the Persians later seized and crucified Hermias, Aristotle wrote a hymn to his memory ^[2][5].

From Assos he moved to the island of Lesbos, and there, in the lagoon of Pyrrha, modern science can fairly be said to have drawn breath. With his student Theophrastus he spent two years watching, dissecting, and recording: cuttlefish and catfish, bees and oysters, the development of the chick in the egg day by day ^[6]. His zoological works describe around five hundred species, classify animals by shared structures, and record observations so fine that some were doubted until the nineteenth century, when the smooth dogfish he described nourishing its young by a placenta-like cord was confirmed exactly as written ^[3][6]. No one had done anything like it before. Charles Darwin, sent the translated work late in life, replied that Linnaeus and Cuvier had been his two gods, "but they were mere schoolboys to old Aristotle" ^[6].

In 343 or 342 BCE Philip II summoned Aristotle to Macedon to educate his son Alexander, then about thirteen ^[2][3]. The lessons were held at Mieza, in a rural sanctuary with shaded walks, and the little that is reliably known suggests a curriculum of Homer, rhetoric, politics, and natural science; Aristotle prepared a special edition of the Iliad that Alexander, by the ancient accounts, kept under his pillow on campaign beside his dagger ^[2][5]. Philip rebuilt ruined Stagira, tradition says, as the teacher's fee ^[2].

How much of the pupil survived in the king is an old argument. Alexander marched east in defiance of his tutor's advice to treat Greeks as kinsmen and Persians as subjects, and the relationship reportedly cooled; when Alexander executed Aristotle's grandnephew Callisthenes, the campaign historian, whatever warmth remained went with him ^[2][5]. The connection paid one lasting dividend to knowledge: ancient writers record that specimens and reports from the conquered East were sent back to the philosopher, and the reach of his zoology, which describes the elephant with unusual accuracy, suggests the pipeline was real ^[5][6].

In 335 BCE, with Macedon supreme in Greece, Aristotle returned to Athens and founded his own school in a grove sacred to Apollo Lyceus, from which it took its name, the Lyceum ^[2][3]. Because he lectured while walking the covered colonnade, the peripatos, his followers became the Peripatetics, the walkers. The school was something new: less a sect than a research institute, with a library that became the model for Alexandria's, collections of specimens, and a program of collaborative inquiry that produced, among much else, descriptions of one hundred and fifty-eight Greek constitutions, of which the Constitution of Athens was recovered from Egyptian papyrus in 1890 ^[3][5].

The morning lectures for students were technical; the afternoon sessions for the public were polished. The published dialogues that made his ancient literary reputation, praised by Cicero as "a golden river," are almost entirely lost; what survives instead are the working treatises, dense lecture texts never meant for publication ^[3][4]. During these Athenian years his wife Pythias died, and he formed a lasting union with Herpyllis of Stagira, mother of his son Nicomachus, for whom the Nicomachean Ethics is named ^[2]. His will, preserved by Diogenes Laertius, provided for both households and freed several of his slaves ^[1].

What Aristotle built in those treatises was nothing less than a map of everything knowable, divided by method into fields whose names are still on the doors: logic, physics, metaphysics, ethics, politics, rhetoric, poetics ^[3][4]. The logical works, later gathered as the Organon, the "tool," invented formal logic outright, analyzing the syllogism so thoroughly that Kant judged the science complete since its birth; it remained the West's standard logic until the nineteenth century ^[3][4].

His physics explains change through four causes, material, formal, efficient, and final, and reads nature as saturated with purpose, each thing striving toward its proper end ^[4]. His metaphysics closes the chain of motion with an unmoved mover, a conclusion medieval theology found irresistible ^[3][4]. The Nicomachean Ethics defines happiness, eudaimonia, not as feeling but as activity, a life lived excellently, with virtue as a habit lying at the mean between extremes: courage between cowardice and rashness, generosity between meanness and waste ^[4]. The Politics, which opens from the observation that man is by nature a political animal, compares constitutions with a naturalist's detachment, and the Poetics, analyzing how tragedy works on an audience through pity, fear, and catharsis, founded literary criticism ^[3][4]. Not all of it has aged well: the same works defend slavery as natural and rank women below men, judgments his later admirers had to argue around ^[3].

When Alexander died at Babylon in 323 BCE, Athens rose against Macedon, and the most famous Macedonian-linked resident in the city made an obvious target. A charge of impiety was prepared, the same instrument that had killed Socrates seventy-six years earlier, resting on the old hymn Aristotle had written for Hermias ^[2][5]. He withdrew to Chalcis on the island of Euboea, where his mother's family had property, reportedly remarking that he would not give the Athenians a second chance to sin against philosophy ^[2].

He died there within the year, in 322 BCE, of a digestive illness, aged sixty-two ^[2][3]. The school passed to Theophrastus, under whom it flourished for decades more. The treatises had a stranger afterlife: by one ancient account they were buried in a cellar in the Troad by careless heirs, sold to a collector, seized by Sulla and shipped to Rome, and finally edited into their surviving order by Andronicus of Rhodes around 60 BCE, the edition on which every later century has depended ^[3][5].

No thinker has held authority so long over so much. Greek commentators taught the treatises for centuries; the Islamic world translated them into Arabic, where al-Farabi, Avicenna, and above all Averroes, known in Latin Europe simply as the Commentator, built philosophy on his foundations ^[3][4]. Re-translated into Latin in the twelfth and thirteenth centuries, Aristotle became the curriculum of the new European universities, and Thomas Aquinas fused his system with Christian doctrine so thoroughly that scholastic philosophy is nearly unthinkable without him. Medieval writers dropped the name altogether and wrote "the Philosopher"; Dante, seeing him among the virtuous of Limbo, called him the master of those who know ^[3][4].

The scientific revolution defined itself by overthrowing him, as Galileo and Newton broke his physics of natural places and purposes ^[3]. Yet the destruction was selective. His logic ruled until Frege; his biology drew Darwin's homage; his ethics of virtue and character returned to the center of moral philosophy in the twentieth century, and the Poetics is still assigned to screenwriters ^[4][6]. The deepest legacy is invisible because it is everywhere: the division of knowledge into disciplines, the habit of beginning from evidence and prior opinion, the conviction that the world is intelligible piece by piece. Much of what any student does in any classroom is still, at bottom, Aristotelian procedure ^[3][4].