William of Ockham

← Encyclopedia

William of Ockham was an English Franciscan friar, theologian, and logician, active in the first half of the fourteenth century and counted among the most consequential thinkers of the late Middle Ages. The name fixes him to a village in Surrey; the work fixed him to a quarrel that would not let him alone. He trained at Oxford, lectured on the standard theological textbook of the day, and was summoned to the papal court at Avignon in 1324 to answer for opinions some of his readers found dangerous. While the inquiry into his writings was still open, he took up a separate and more explosive cause — the Franciscan insistence that Christ and the apostles had owned nothing — sided against the pope on it, and in 1328 fled north to the protection of the Emperor Louis of Bavaria. He spent the rest of his life in Munich, writing on the limits of papal power, and is thought to have died there around 1347, possibly in the plague.

Oxford, the Sentences, and the title that stuck

He was born around 1287 in Ockham, a hamlet in Surrey, and entered the Order of Friars Minor young — the order founded a century before by Francis of Assisi, whose insistence on holding nothing would later become the axis of Ockham’s own life. He studied at the Franciscan house and at Oxford, where the curriculum ran through the logic and natural philosophy of Aristotle and culminated, for a theologian, in lecturing on the Sentences of Peter Lombard — the twelfth-century compilation that every aspiring master glossed in turn, the common scaffolding of the schools. Ockham delivered those lectures around 1317–1319; the written-up version of the first book, his Ordinatio, he revised with care, while the remaining books survive as student reports, the Reportatio.

The lectures impressed students and alarmed the authorities in roughly equal measure. By the ordinary course he should have proceeded from bachelor to a regent master’s chair, the right to teach as a full doctor. He completed the remaining requirements and held his inceptio, the formal commencement act — which is why he is known by the curious honorific Venerabilis Inceptor, the Venerable Beginner — but he never actually took up a chair. The career stalled, and the reason was the disquiet his teaching had stirred. The chancellor of Oxford, John Lutterell, had been removed from office in 1322 and went to Avignon, where he laid before the pope a list of propositions drawn from Ockham’s Sentences commentary, denounced as contrary to sound doctrine. This was the thread that pulled the rest into motion.

Avignon, poverty, and flight

In 1324 Ockham was summoned to the papal court, then seated at Avignon under Pope John XXII. A commission of theologians sifted his writings, and in 1326 returned fifty-one propositions judged open to censure. The process dragged. While it was still unresolved, a second and far hotter controversy reached the same court — and Ockham, instead of keeping his head down, walked straight into it.

The Franciscans had long held that Christ and the apostles owned nothing, neither individually nor in common, and that the order’s own renunciation of property was the truest imitation of that poverty. The legal fiction that made this workable — the friars used goods to which the papacy held title — John XXII dismantled in a series of bulls, declaring the doctrine of the absolute poverty of Christ erroneous, even heretical. The Minister General of the order, Michael of Cesena, came to Avignon to fight the ruling and set Ockham to examine the papal documents. Ockham read them and concluded that the pope had taught error — and, in pressing the point, that a pope who taught heresy forfeited his authority. The inquiry into his philosophy and the quarrel over poverty had fused into a single charge of defiance.

In May 1328 he fled Avignon with Michael of Cesena and a small company, made for Pisa, and placed himself under the protection of Louis IV of Bavaria, the emperor then locked in his own long struggle with the same pope. He was excommunicated for the flight. From Pisa the party moved to Munich, and there Ockham passed the remaining two decades of his life, no longer the rising logician of Oxford but a polemicist of empire against papacy, writing tract after tract on the limits of the keys — the Work of Ninety Days, the vast unfinished Dialogus, the Breviloquium on tyrannical rule. He argued that spiritual and temporal power are distinct, that the pope’s authority does not extend over the secular order, and that even within the Church it is bounded by Scripture and by the freedom of the faithful. This was the poverty dispute carried to its constitutional conclusion. It belongs to the same Franciscan ferment that fed the Spiritual wing of the order and, at its radical edge, the apocalyptic expectations gathered around Joachimite prophecy — though Ockham’s own fight was juridical and ecclesiological, not a reading of the ages of the world. He is thought to have died in Munich around 1347, perhaps carried off by the plague then beginning its sweep through Europe.

Nominalism: the world exhausted by singulars

Two things keep his name in circulation. The first is nominalism: the position that only individual things exist, and that the universal terms by which the mind groups them — humanity, whiteness, animal — are not features of the world but concepts, names that stand for many particulars at once. Against the realists, who held that such universals had some genuine existence, he argued that the world is exhausted by singulars, and that to multiply entities beyond these was to mistake the furniture of thought for the furniture of reality.

For Ockham a universal is, more exactly, a sign — a natural sign in the mind that signifies many things at once, expressed downstream in the conventional signs of spoken and written speech. There is no common nature shared out among individuals and no shadowy humanity in which Socrates and Plato both partake; there is Socrates, and there is Plato, and there is the mental term by which the intellect ranges them together. This made him the sharpest medieval critic of the moderate realism of Thomas Aquinas and of the subtle, qualified realism of his own Franciscan predecessor Duns Scotus, whose formal distinction between the common nature and its individuating principle Ockham rejected as a needless reification. The full machinery of the dispute — what realists, conceptualists, and nominalists each meant by a universal, and what hangs on the choice — runs through the long quarrel over universals; Ockham stands near its sharpest turn. His was also a program in metaphysics as much as in logic: it pruned the catalog of what there is. Where earlier scholasticism had populated the world with relations, quantities, and shared natures as so many real things, Ockham reduced the basic furniture to two kinds, substances and qualities, and treated the rest as ways of talking — true of the singulars, but not extra items beside them.

The razor he wielded but did not coin

The second is the maxim that came to be called Ockham’s razor. He did not coin the polished Latin tag usually quoted for it, and the underlying rule of economy was old by his time; what he did was wield it relentlessly — that one should not posit more than the evidence and the argument require. In his hands it was a tool for cutting away the surplus metaphysics he thought earlier philosophy had let accumulate.

What Ockham actually wrote were plainer formulas. Plurality is never to be posited without necessity, runs one, from the Sentences commentary; it is futile to do with more what can be done with fewer, runs another, in the Summa Logicae, his great handbook of logic. The crisp slogan most people quote — entities are not to be multiplied beyond necessity — is nowhere in his surviving work. That phrasing was fastened to his name centuries later: the Irish Franciscan John Punch, writing a commentary on Duns Scotus in 1639, gave the principle its lapidary form and treated it as a common axiom of the schoolmen. The rule itself reaches back through Scotus and Robert Grosseteste to Aristotle, who held that nature does nothing in vain. The razor, in other words, is a genuine principle of Ockham’s practice wearing a borrowed Latin coat. Misattributed at the edges, it is not misattributed at the core — he did cut, and he cut with it more insistently than anyone before him, turning a maxim of method into something close to a temperament.

The unconstrained will, and the parting of reason from faith

Underneath both lay a theology of the divine will. Ockham held that God’s freedom and power are unconstrained, that the moral and natural orders are as they are because God willed them so and could have willed otherwise, and that much of what reason had claimed to demonstrate about God belonged properly to faith. That separation — reason and revelation drawn apart rather than fused — unsettled the confident synthesis of the previous generation and shaped the disputes of the century that followed.

The scaffolding of this voluntarism was a distinction the schoolmen had been sharpening for a generation: God’s absolute power and God’s ordained power. Considered in the absolute, God can do anything that does not involve a contradiction — the present order of grace, nature, and morality is one He chose freely and could have arranged otherwise. Considered as ordained, God acts within the order He has in fact established and reliably keeps. Ockham pressed the absolute side harder than his predecessors, and the consequences ran in two directions. In ethics it tilted toward a divine-command view: an act is good because God commands it, not commanded because independently good. In natural philosophy it loosened the grip of necessity — if the connections we observe hold by God’s free ordinance rather than by any inner compulsion in things, then they are known by experience of the singulars, not deduced from essences. The contingency of the world threw weight onto what can actually be observed.

That last move carried a long reach. His followers gathered his teaching into the via moderna, the modern way, set against the via antiqua of the realist masters, and it became one of the dominant currents in the universities of the fifteenth century. The line of emphasis runs onward to empiricism — to a philosophy that grounds knowledge in the particular and the perceived rather than in real universals — and the parsimony principle became permanent equipment for anyone who reasons about explanations. Even a rationalist of the next age such as Gottfried Wilhelm Leibniz, who would people the world with infinitely many substances and defend the richness of being against any razor, wrote in full awareness of the demand for economy that Ockham had made unavoidable; one answers parsimony either by satisfying it or by arguing past it, and Leibniz did the second.

Texts and scholarship

The editorial recovery of Ockham is itself a chapter in his reception. For centuries he was read through early printings and the polemical haze of the via moderna–via antiqua battles; the modern critical edition only arrived in the twentieth century, when the Franciscan Institute at St. Bonaventure University published his Opera Theologica in ten volumes (1967–1986) and his Opera Philosophica in seven (1974–1988), giving scholars for the first time a reliable Latin text of the logic, the Sentences commentary, and the Quodlibeta. The standard interpretive study built on that foundation is Marilyn McCord Adams’s two-volume William Ockham (University of Notre Dame Press, 1987), a fourteen-hundred-page reconstruction of his metaphysics, epistemology, and theology that remains the reference point for serious work; a review in the journal Nuncius registered its scale and ambition on publication. The first collective volume to draw fully on the new critical editions was the Cambridge Companion to Ockham, edited by Paul Vincent Spade (Cambridge University Press, 1999), with chapters on the logic, the semantics of mental language, the natural philosophy, the ethics, and the political writings. The synoptic scholarly account, regularly revised, is the Stanford Encyclopedia of Philosophy entry on Ockham by Spade, Claude Panaccio, and Jenny Pelletier, which sets the nominalist semantics beside the theology of the divine will rather than treating either in isolation. On the razor specifically, the long correction of the popular misattribution begins with W. M. Thorburn’s 1918 essay The Myth of Occam’s Razor, which traced the famous slogan away from Ockham and toward the later schoolmen who actually framed it.

Later historians have made him a hinge figure, the point at which medieval thought is said to turn toward the modern: toward a sparer logic, a sharper line between what can be proved and what must be believed, and a suspicion of grand explanatory schemes. The reading is contested, and the razor has been credited with more than he ever cut. What is not in doubt is that he wrote to clear ground, and that a good deal of what came after was built on the cleared ground he left.

→ Related: Middle Ages · Neoplatonism · Scholasticism · Universals · Thomas Aquinas · Duns Scotus · Francis Of Assisi · Aristotle · Metaphysics · Empiricism · Gottfried Wilhelm Leibniz · Joachimite Apocalypticism