Aristotle

Aristotle (384–322 BCE) was an Ancient Greek philosopher and scientist whose intellectual ambition — to understand and systematise the entirety of human knowledge — produced the most comprehensive body of work in the history of Western thought. His writings on logic, metaphysics, ethics, politics, biology, physics, poetics, rhetoric, psychology, and the philosophy of science established the framework within which the West conducted intellectual inquiry for over two millennia. He was a student of Plato, the tutor of Alexander the Great, and the founder of the Lyceum in Athens. Thomas Aquinas called him simply “the Philosopher.”

Life

Aristotle was born in Stagira, a small city in northern Greece (in what is now Macedonia). His father, Nicomachus, was a physician at the court of Amyntas II of Macedon, and Aristotle’s early exposure to biology and empirical observation may reflect this medical background. At seventeen, he went to Athens and joined Plato’s Academy, where he studied and taught for twenty years, until Plato’s death in 347 BCE.

He left Athens after Plato’s death — possibly because Plato’s nephew Speusippus, not Aristotle, was chosen to head the Academy — and spent several years in Asia Minor and Lesbos, where he conducted extensive biological research (his observations of marine life on Lesbos are remarkably detailed). In 343 BCE, Philip II of Macedon invited Aristotle to tutor his son Alexander, then thirteen. The tutorship lasted about three years; what Aristotle actually taught Alexander is largely unknown, though the relationship between the greatest philosopher and the greatest conqueror of the ancient world has fascinated historians ever since.

In 335 BCE, Aristotle returned to Athens and founded his own school, the Lyceum, in a grove sacred to Apollo Lykeios. His students were called Peripatetics, from the covered walkway (peripatos) where Aristotle reportedly lectured while walking. He taught at the Lyceum for twelve years. After Alexander’s death in 323 BCE, anti-Macedonian sentiment made Athens dangerous for Aristotle, who had Macedonian connections. He withdrew to Chalcis on the island of Euboea, reportedly saying he would not allow Athens to “sin twice against philosophy” (a reference to Socrates’s execution). He died there the following year.

The Works

Aristotle’s surviving works — approximately thirty treatises — are believed to be lecture notes or working papers rather than polished publications. His published dialogues, which were apparently literary masterpieces (Cicero praised their “golden flow”), are entirely lost.

Logic (Organon): Aristotle virtually invented formal logic. The Organon — comprising the Categories, On Interpretation, Prior Analytics, Posterior Analytics, Topics, and Sophistical Refutations — established the syllogism as the basic structure of deductive reasoning. Aristotelian logic remained the dominant system until Frege and Russell revolutionised the field in the nineteenth and twentieth centuries.

Metaphysics: The Metaphysics — the title means “after the physics” and refers to its placement in ancient editions — investigates being qua being, substance, causation, and the nature of the divine. The doctrine of the four causes (material, formal, efficient, final) and the concept of the Unmoved Mover are among its most influential contributions.

Ethics: The Nicomachean Ethics — probably named for his son Nicomachus — is one of the foundational works of moral philosophy. Its central concept is eudaimonia (happiness, or flourishing), achieved through the practice of virtue, which Aristotle defines as a mean between extremes. The virtuous person does the right thing, at the right time, in the right way, for the right reasons — a standard that is aspirational rather than algorithmic.

Politics: The Politics analyses constitutions, citizenship, and the ideal state. Aristotle’s claim that “man is by nature a political animal” — meaning that human beings can only fully realise their nature within a political community — remains one of the most quoted sentences in political philosophy.

Poetics: The Poetics — surviving only in its treatment of tragedy (the second book, on comedy, is lost) — defines tragedy as the imitation of a serious action that produces catharsis through pity and fear. The concepts of hamartia (tragic flaw or error), peripeteia (reversal), and anagnorisis (recognition) continue to structure how we think about dramatic narrative.

Biology: Aristotle was a tireless observer of animal life. The History of Animals, Parts of Animals, and Generation of Animals contain hundreds of observations — many strikingly accurate — about anatomy, reproduction, and behaviour. Darwin called him “the greatest observer who ever lived.”

Influence and Legacy

Aristotle’s influence on Western civilisation is beyond calculation. His logic, metaphysics, and ethics were synthesised with Christian theology by Thomas Aquinas in the thirteenth century, producing the Scholastic system that dominated European thought for centuries. The Islamic philosopher Averroes (Ibn Rushd) called Aristotle’s work “the supreme truth.” The Scientific Revolution partly defined itself against Aristotle — Galileo, Bacon, and Descartes all rejected aspects of his natural philosophy — but many of his concepts (form, matter, potentiality, actuality, causation) remain embedded in philosophical and ordinary language.

Collecting Aristotle

Early printed editions of Aristotle are major rarities. The Aldine edition of the complete works (Aristotelis Opera, Venice, 1495–1498, five volumes) is one of the landmarks of early printing. Individual Renaissance Latin translations can be found for $500–$5,000 depending on the work and edition. Modern scholarly editions (Oxford Classical Texts, Loeb Classical Library) are affordable and readily available.