Aristotle

By Nadia El-Masri

He tried to know everything — and very nearly did. Aristotle of Stagira is the most comprehensive mind the ancient world produced: logician, biologist, physicist, ethicist, political theorist, literary critic, and the tutor of Alexander the Great. For two thousand years, to be educated meant, in large part, to have read Aristotle. Even now, when science has left most of his physics behind, his method of organizing knowledge remains the skeleton of every encyclopedia, every taxonomy, every curriculum.

Born in 384 BCE in Stagira, in northern Greece, the son of a court physician, Aristotle arrived in Athens at seventeen and joined Plato's Academy, where he stayed for twenty years — first as the most brilliant student, then as a restless colleague who respectfully dismantled his teacher's theory of Forms. After Plato's death he wandered, married, and spent years on the island of Lesbos dissecting marine animals, the happiest research period of his life. Then came the famous appointment: Philip of Macedon hired him to tutor the thirteen-year-old Alexander. When Alexander marched east, Aristotle returned to Athens and founded his own school, the Lyceum, in a grove sacred to Apollo, walking as he lectured — hence his followers' name, the Peripatetics, the walkers.

His scientific achievement rests on two pillars. The first is logic: in the works collected as the Organon, Aristotle invented the syllogism and with it the very idea of formal reasoning — that arguments have structures that can be studied independently of their content. It was the first great instrument of the mind, and it dominated logic until the nineteenth century. The second is biology: Aristotle dissected over five hundred species, described the placenta, distinguished whales from fish, classified animals by their anatomy and reproduction, and founded comparative anatomy and embryology. His marine observations on Lesbos were so accurate that modern zoologists still admire them.

His physics — earth, air, fire, water, natural places, the unmoved mover — was a magnificent, wrong, two-thousand-year detour, and his authority eventually became a cage: medieval scholars treated his texts as scripture, and breaking out took a revolution. He fled Athens at the end, they say, "lest Athens sin twice against philosophy," after the charge of impiety that had killed Socrates. He died in exile at sixty-two. What survives is the deeper achievement: the conviction that the world is intelligible through causes, that knowledge must be organized by genus and species, and that everything — even the soul — repays patient, systematic study.

Impact on civilization

Aristotle gave civilization its operating system for knowledge: formal logic, the classification of the living world, and the program of explaining phenomena through causes. His biology founded zoology and embryology; his logic ruled reasoning for two millennia; his encyclopedic method became the template for every library and university curriculum. Even where he was wrong — and his physics held science back for centuries — he was wrong in the most productive way possible: by giving the future something definite to refute.