Aristotle

Aristotle of Stagira

Picture the founder of Western logic standing in a coastal lagoon on the island of Lesbos, sleeves pushed up, dissecting a cuttlefish. Aristotle, a physician's son, spent some of his most productive years on that island doing what no philosopher before him had thought worth the trouble: looking, closely and patiently, at the living world. He described hundreds of kinds of animal and cut open dozens, got the breeding of certain sharks and the four-chambered stomach of cattle right in ways no one would match for two thousand years. Hold that picture, because it is the key to everything else, and it is the reverse of the dust-dry system-builder the textbooks hand down. Where his teacher Plato had pointed upward, to a heaven of perfect Forms of which our world is a smudged copy, Aristotle looked down and out, at the cuttlefish and the bee and the growing child, and became convinced that the real and the knowable are not in some other world at all. They are right here, in the things themselves.

Form in the thing. Aristotle had spent twenty years inside Plato's Academy, and he left persuaded that his teacher had made one enormous mistake. He agreed there must be stable things to know, real forms and universals, or knowledge would be impossible; he simply denied that they live in a separate heaven. The form of a thing, he insisted, is in the thing. A bronze sphere is matter, the bronze, organized by form, its sphericity, and that form is not a second object the bronze copies from afar; it is the bronze's own structure, and you could no more peel it off and keep it than you could keep the shape of a wave without the water. This is hylomorphism, the doctrine that every concrete being is matter informed by form, and it moves the center of gravity of the world. For Plato the truly real was the universal, glimpsed beyond the senses; for Aristotle it is the individual standing in front of you, this man, this horse, this bronze sphere. It is worth being clear that this is not a triumph of matter over form, the way a modern materialist might wish it. Form, for Aristotle, is entirely real, and it is precisely what makes a thing the kind of thing it is. He refused only to let it float free of the world it shapes.

The four becauses. If you want to explain why something is as it is, Aristotle says, you are not finished until you have answered four quite different questions, and much later confusion comes from running them together. Take a bronze statue. What is it made of? The bronze, its material cause. What is it? A figure of Athena, its formal cause. What brought it into being? The sculptor, its efficient cause. And what is it for? To stand in the temple and honor the goddess, its final cause. The first three the modern sciences kept; the fourth, the final cause, the for-the-sake-of-which, they threw out as superstition when it came to dead matter, and they were largely right to. But in the living world, where Aristotle's eye was sharpest, the final cause is hard to avoid. An acorn is not merely shoved into becoming an oak by forces pushing from behind; it is oriented toward the oak, organized around a mature form it is reaching to realize, and you have not understood a living thing until you can say what it is for. Modern biology spent three centuries insisting it had banished such talk, and then quietly let it back in under the names function and adaptation. The eye is for seeing after all.

Potential and actual. The same biological eye dissolved the oldest puzzle in Greek philosophy. Parmenides had argued that change is impossible, since a thing cannot come from nothing or pass into nothing; Heraclitus had answered that change is the only thing there is. Aristotle broke the deadlock with a single distinction. An acorn is not yet an oak, but neither is it nothing-of-an-oak; it is an oak potentially, and growth is just the actualizing of that potential. Everything that changes does so by passing from potentiality, dynamis, to actuality, energeia: the seed to the tree, the student to the scholar, the block of marble to the statue already waiting inside it. Change is neither the impossible leap from sheer non-being into being that had paralyzed Parmenides, nor the bottomless flux of Heraclitus, but the orderly unfolding of what a thing already holds it in itself to become. It is one of those rare moves that, once you have it, looks too obvious to have needed inventing, which is the surest sign that someone had to invent it.

The science of living well. The same down-to-earth temper produced the most humane ethics in the Western tradition, and very likely the one you already half hold. Aristotle does not begin with rules to obey or with the purity of your inner motive. He begins by asking what it is for a human being to do well, to flourish, and gives the answer a careful name, eudaimonia, which is badly served by the word happiness, because it is not a feeling at all. It is a whole life of activity that exercises our finest capacities, above all our power to reason and to act well, sustained over time, the way a fine musician is not someone who feels musical but someone who plays well across a career. Virtue, on this account, is a trained disposition to find the mean between too much and too little, courage between cowardice and recklessness, generosity between stinginess and waste, and the mean is never a fixed average but the right amount in the particular case, which only practical wisdom, phronesis, can judge on the spot. You cannot get it out of a book. You acquire it the way you acquire any skill, by practice and habit and the company of people who already have it. It is an ethics for adults living in time, and after a long modern detour through rules and calculations the philosophers came back to it.

The instrument, and the method. Aristotle also handed every later thinker a tool so basic that we use it without recalling whose it is. He noticed that some inferences hold by their shape alone, whatever they are about: if all M are P, and all S are M, then all S are P, regardless of whether the terms are men and mortals or whales and mammals. Out of that observation he built the syllogism and the first formal logic, and for two thousand years "logic" simply meant his logic, until the nineteenth century enlarged it. But the method behind the method is less famous and more useful still. Aristotle liked to start from the endoxa, the things people reputably believe, lay out the puzzles that surface when those beliefs collide, and then look for the position that rescues as much of each as it can. He treated the appearances and the common wisdom not as illusions to be cleared away but as data to be explained, and that respect for what is actually the case is exactly why he, and not the system-builders, founded the empirical sciences. The room carries the Nicomachean Ethics, the Politics, the Poetics, and the Categories in their old public-domain translations, cited by the Bekker numbers that run down the margin of every edition, so that Nicomachean Ethics 1106b36 lands where you can check it.

No body of work has been built on more heavily. The Peripatetics carried it forward; the great Arabic philosophers, al-Farabi and Avicenna and the man they called simply the Commentator, Averroes, preserved and deepened it while Europe forgot it; Maimonides thought through Judaism with it; and when the texts came back to the Latin West in the twelfth century, Aquinas spent his life fitting Christianity to its frame. For five centuries Aristotle was so completely "the Philosopher" that to do science was to footnote him, which is finally what goaded the seventeenth century into revolt, Galileo and Descartes defining the new physics by everything of his they threw out. And yet the revolt reached only the physics. His ethics, his politics, his poetics, and his biology survived it, and the twentieth century, worn out by moral rulebooks, went back to the Nicomachean Ethics as if to fresh water. The lesson of his enormous afterlife is the one his whole method teaches: that the way to understand the world is not to turn from it toward something purer, but to look harder at the thing in front of you, draw the distinctions it actually has, and trust that the truth is in there to be found.