Ockham

William of Ockham

Everyone has heard of Ockham's Razor: the principle that, faced with competing explanations, you should prefer the simplest, the one that assumes the fewest things. It has become a kind of folk wisdom, quoted by detectives and scientists and people winning arguments at dinner. What almost no one remembers is the man whose name it carries, or that for him it was no tidy rule of thumb but a weapon, which he used to take a chainsaw to the most elaborate intellectual structure of his age. By the early fourteenth century, scholastic philosophy had grown into a dense forest of metaphysical entities, common natures, formal distinctions, real distinctions, intelligible species, the careful machinery the schoolmen had built to explain how the world hangs together. William of Ockham, an English Franciscan with a ferociously sharp mind, looked at the whole of it and asked one devastating question: do we actually need any of this? His answer, again and again, was no, and the cuts he made cleared a space in which something recognizably modern could begin to grow.

Only individuals are real. The deepest cut of all was aimed at universals, and to feel its force you have to see what nearly everyone before him believed. Look at two dogs. They are plainly the same kind of thing; they share something, "dogness," the nature of dog. The realists, Aquinas and Scotus among them, held that this shared nature is real, that "dogness" has some genuine being of its own, somehow present in every dog, a universal that the many individuals all participate in. Ockham said this was a fantasy, a case of being fooled by our own words. There is no such thing as "dogness" floating in or above the dogs. There are only this dog and that dog, individuals, each utterly particular; and when we notice that they resemble one another and file them under the single word "dog," the universal exists only there, as a concept in our minds and a word on our tongues, never as a thing in the world. The world, for Ockham, contains nothing but individuals. Every abstraction, every general category, every "kind," is something the mind does, not something it finds. This is nominalism, and it is one of the great forks in the history of thought: the suspicion that a vast amount of our supposed knowledge of reality is really just knowledge of our own classifications, and that we forever mistake the names we have invented for the furniture of the universe.

The language in your head. If universals live only in the mind, then logic itself has to be rethought as a study of what the mind does, and here Ockham made another startlingly modern move. Beneath the words you speak, he argued, lies an inner language, a "mental language" with its own grammar and its own terms, the same in every human mind whether you happen to think in English or Latin or Arabic. Spoken words are merely the audible signs we hang on these inner concepts; the real logic of thought runs at the level below speech, in a kind of universal code common to all minds. It is a remarkably contemporary idea, this notion of a single "language of thought" underlying all the surface languages we happen to speak, and it would be rediscovered and fought over by cognitive scientists six hundred years later. From the same parsimonious instinct that drove the razor, Ockham was quietly refounding logic as the study of the mind's own inner syntax, which is one reason he is now counted among the first real philosophers of language.

A world that did not have to be. Ockham was also a theologian, and his theology drove him, by a strange route, right up to the door of modern science. He held an absolute view of God's freedom: that God could have made the world, and even the moral law, entirely otherwise than he did. There is nothing in the nature of things that forced the universe to be as it is; God simply chose, and could have chosen differently. Now follow the consequence, which Ockham may not have fully intended. If the world did not have to be this way, if it is radically contingent, the product of a free choice rather than of logical necessity, then you cannot work out how it runs by sitting in a chair and reasoning from first principles, the way the Greeks had hoped. A contingent world cannot be deduced; it can only be observed. You have to go and look, to find out which of the countless ways God could have arranged things he actually did. Put that together with the razor's demand to assume only what you need to explain what you see, and with the nominalist's insistence that what is really out there is just particular individuals, and you have, in embryo, the whole attitude of the modern scientist: distrust grand systems spun from pure reason, attend to the particular observed fact, and keep your theoretical baggage to the minimum the evidence requires. The forest Ockham cleared was where empiricism would take root.

Faith on one side, reason on the other. Aquinas, a couple of generations earlier, had staked his life's work on the grand harmony of faith and reason, the confidence that philosophy could climb a long way toward the truths of religion and never contradict them. Ockham, with his razor and his radically free God, quietly took that bet apart. If God could have done anything that is not self-contradictory, then very little about him can be proven by reason at all; the central claims of faith, that the world was created, that God is three in one, that the soul is immortal, become things you believe on authority, not things you demonstrate. Ockham did not do this to wound religion; he was a friar, and he believed he was defending God's freedom and faith's purity against the overreach of philosophy. But the effect was a quiet divorce. Reason and faith, which Aquinas had married, began drifting into separate rooms, philosophy increasingly free to follow its own methods without theological supervision, theology increasingly a matter of revelation alone. That separation, uncomfortable for nearly everyone at the time, is one of the foundations the modern, secular intellect would eventually be built on.

The pen against the sword. The room reads Ockham mostly from the record rather than the page, since his dense scholastic Latin survives in modern English only under copyright; the chat works from that knowledge and says so. His razor and his nominalism founded the via moderna, the "modern way," that swept the universities and shaped the schooling of the men who would make the Reformation, Luther among them. But there was one more demolition left in him. Drawn into a furious dispute over whether the Church should own property, Ockham turned his analytic ferocity on power itself, and wrote, from exile under an emperor's protection, against the claim that the Pope held unlimited authority. He argued for limits on sovereign power, for the rights of the governed, for the independence of secular government from religious control, anticipating, centuries early, the constitutional instincts of the modern world. A legend has it that he told the emperor, "defend me with the sword, and I will defend you with the pen." Whether or not he ever said it, it catches him exactly: a mind that cut, with equal sharpness, through bad metaphysics and through overreaching power, and left the ground clearer behind it.

It is tempting, for those who love the grand systems Ockham dismantled, to cast him as a destroyer, the man who broke the beautiful medieval synthesis and ushered in a colder, flatter world of mere particulars and mere facts. There is something to that. But the deeper truth is that Ockham was after honesty. He could not abide explaining things by inventing entities, mistaking the words in our heads for the structure of reality, or letting either philosophers or popes claim more authority than they could earn. His razor is, in the end, an ethic of the intellect: do not believe in more than you must; do not multiply the world to flatter your theories; keep faith with the particular thing in front of you over the grand abstraction that promises to explain it. It is a discipline modern science could not have done without, and a corrective the mind needs in every age, including ours, with its own overgrown forests of jargon and its own habit of mistaking its categories for the world. Sometimes the most creative thing a thinker can do is to take things away.