Pietro Pomponazzi

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Pietro Pomponazzi (1462–1525) was an Italian Aristotelian philosopher, remembered for two arguments that pressed natural reason to its limits: that philosophy cannot prove the human soul immortal, and that marvels commonly laid to spirits or demons can be explained by ordinary causes. Born in Mantua and trained at Padua, he taught there and later at Ferrara and Bologna, in the university culture that read Aristotle as a working scientist of nature rather than a half-Christian sage. He was small, plain in manner, sharp in the lecture hall, and known to colleagues by a nickname, Peretto — “little Pietro” — for his short stature. The nickname outlasted the man and attached itself, in the next generation, to the most dangerous position in Italian natural philosophy.

The schools of Padua

The Padua where Pomponazzi was formed was the most intensely Aristotelian university in Europe, and a place where the study of nature and the study of medicine ran together. He matriculated young, took natural philosophy under Nicoletto Vernia and Pietro Trapolino, metaphysics under Francesco Securo da Nardò, and medicine under Pietro Roccabonella, finishing with a degree in medicine in 1487. He began teaching almost at once, as an extraordinary lecturer in 1488, and rose to an ordinary chair of natural philosophy in 1495. When Vernia died in 1499, Pomponazzi succeeded to his teacher’s place. This was a career made entirely inside the Aristotelian curriculum — not the humanist’s recovery of elegant Latin and lost Greek poets, but the patient, technical reading of the De anima, the Physics, the Meteorology, and the long Arabic and Latin commentaries that had grown up around them.

That curriculum had split on a single question: what Aristotle had actually taught about the intellect, and whether his philosophy left room for a soul that survives death. Three readings competed. The followers of Averroes held that there is one immortal intellect for all humanity, in which individuals participate without owning it — a doctrine that saved a kind of immortality but not a personal one. The followers of Thomas Aquinas held that Aristotle could be reconciled with the Church: that the rational soul is the form of the body and yet subsists on its own, immortal and individual. And a third party looked back past both to Alexander of Aphrodisias, the ancient Greek commentator of around 200 CE, who had read Aristotle to mean that the intellect is bound to the body of the individual and so perishes with it. The Alexandrists are named for that reading, and Pomponazzi gave it its hardest, clearest statement.

The thread of his life was cut by war. In 1509 the armies of the League of Cambrai besieged Padua and the university closed; Pomponazzi withdrew to Ferrara for about a year, then settled at Bologna, where he held a chair of philosophy from 1512 until his death. The most consequential decade of his work was spent there, in a city under the eye of the papacy, far from the relative shelter of the Venetian terraferma.

The treatise on the soul

His reputation rests on the Tractatus de immortalitate animae of 1516. The question was old, but Pomponazzi pursued it with unusual rigor. Working strictly within Aristotle’s own premises — that the soul is the form of the body, and that human thought always depends on the phantasmata, the images drawn from sense and matter — he concluded that, on natural grounds alone, the soul cannot be shown to survive the body. The reasoning is tight. If every act of human intellect requires a phantasm, an image furnished by the bodily senses, then the intellect cannot do its proper work once the body and its organs are gone. A power that cannot operate without the body is not a power that can be shown to outlast the body. Reason, Pomponazzi held, points the other way: the soul is mortal as a natural object, even though it is the highest and least material of mortal forms, touching immortality without reaching it.

He met the obvious objection — that a deathless soul is needed to make the moral life intelligible, since otherwise the wicked prosper unpunished and the good go unrewarded — by refusing the bargain entirely. Virtue, he argued, is its own reward and vice its own punishment; the good man is paid in his goodness, the wicked man penalized by his own corruption, and an ethics that needs the promise of heaven and the threat of hell to function is an ethics of hirelings. This was not a side remark. It was a Stoic and Aristotelian theory of the worth of the moral life that did not lean on immortality at all, and it was as provoking to his readers as the central denial.

Then he declared that he accepted the soul’s immortality nonetheless, as an article of faith fixed by the Church. The conclusion reached by natural reason, he held, left the contrary truth of revelation untouched: the philosopher reasons to mortality, the Christian believes immortality, and the believer’s certainty is not undone by the philosopher’s argument because the two rest on different grounds. Whether that submission was sincere or a shield has been argued ever since. What is not in doubt is the storm it raised, and what made the timing so dangerous. Three years earlier, in December 1513, the Fifth Lateran Council had issued the decree Apostolici regiminis, which declared the immortality of the individual soul a matter of dogma and instructed teachers of philosophy, when expounding doctrines at odds with the faith, to refute them and teach the Christian truth. Pomponazzi had done the opposite: he had stated the case for mortality with more force than anyone, and then declined to refute it on its own ground, sending the reader to faith instead.

The storm of 1516

The book was publicly burned in Venice, and Pomponazzi was answered by theologians and philosophers across Italy. A Franciscan, Ambrogio Fiandino, preached against him from the pulpit; his own former student Gaspare Contarini — later a cardinal and a reformer — wrote his own treatise to refute him; and at the request of Pope Leo X, the Aristotelian Agostino Nifo composed a formal rebuttal, the Tractatus de immortalitate animae contra Pomponatium, defending the Thomist reading and the dogma. The charge of heresy hung close. What kept Pomponazzi from the worst of it was protection: the support of Cardinal Pietro Bembo, the great humanist and a man with the ear of Rome, who shielded him from prosecution.

Pomponazzi did not retreat. He answered with two further works, each longer than the original treatise it defended: the Apologia of 1518, which took up the objections of Contarini and the others and recounted the uproar at Venice, and the Defensorium adversus Augustinum Niphum of 1519, his reply to Nifo. In both he held his line and tightened it: his book, he insisted, had only shown that Aristotle held the soul to be mortal and that natural reason could not prove otherwise — not that the soul is mortal, which faith denies. He had drawn, sharply, the line between what philosophy can demonstrate and what religion affirms. Later shorthand calls this “double truth,” but the phrase was not his, and the position he held was more careful than the slogan: he did not say that something can be true in philosophy and false in theology at once, but that philosophy’s demonstrations and faith’s certainties belong to different orders and reach their conclusions by different means. The “double truth” tag had been hung on the Averroists by their enemies; it was hung on Pomponazzi the same way, as an accusation rather than a self-description.

The naturalizing of wonders

A second work turned the same naturalism on miracles and magic. De incantationibus — “On Incantations” — was written around 1520 and circulated in manuscript among friends; it was too dangerous to print, and saw the press only in 1556, when a Protestant exile published it at Basel, three decades after its author’s death. Its subject is the whole field of the wondrous: cures at shrines, prophecies and dreams, apparitions and portents, omens, charms, the reported feats of sorcerers and necromancers, and miracles both inside and outside Scripture. Pomponazzi’s claim is that such things, where they are real, follow from natural powers and need no appeal to angels or devils.

His instruments are three. First, the influence of the heavens: the bodies of the sky, in the inherited cosmology, are the great regular causes that govern the sublunary world, and what looks like a break in nature is more often a rare and extreme effect of celestial causation that we are too ignorant to track. Second, the hidden virtues in things — the occult powers that one body has to act on another at a distance, the kind of naturalism that let a magnet draw iron without anyone calling it a demon. Third, and most striking, the force of imagination: the conviction that the vis imaginativa, the imaging power of a strong soul, can work effects on the imaginer’s own body and even, through the medium of the air and the stars, on others — that faith heals, that fear sickens, that a confident prophet shapes the crowd that believes him. Pomponazzi did not deny that strange things happen. He denied that they require breaking the order of nature to explain. A “miracle,” on this account, is not a violation of natural law but a marvel within it — unusual, rare, badly understood — and the demons and spirits invoked to account for it are surplus.

He pressed the argument further than cures and charms. The rise and fall of religions themselves, he proposed, runs on the same celestial clock: each faith has its season, ascending and declining under the changing configurations of the heavens, with its founders, signs, and miracles as natural products of an astral cycle rather than interruptions of it. Stated plainly of Christianity, this was incendiary, and it is why the book stayed in his desk. It was also one of the first wholly naturalistic theories of religion to be written in Europe since antiquity. He kept the formal escape he had used before — these are the conclusions of natural philosophy, and faith corrects them where they touch the truths of the Church — but the machinery of the explanation left very little for the supernatural to do.

A companion treatise, De fato, de libero arbitrio et de praedestinatione — on fate, free will, and predestination — pursued the deepest version of the same problem and was likewise printed only after his death, at Basel in 1567. Here Pomponazzi reasoned from Aristotle’s universe of a single chain of causes descending from God as First Cause and Unmoved Mover. If that chain is unbroken, the room for genuine chance and uncoerced free will narrows almost to nothing — and Pomponazzi, against Alexander of Aphrodisias, who had defended contingency against the Stoics, leaned toward the Stoic side: a tightly determined world in which providence is the order of causes itself rather than a separate agency reaching in from outside. The work reached no comfortable settlement, and its difficulty is the measure of its honesty; he followed the determinist reading to ground he plainly found uninviting.

The Alexandrist and the cool current

Scholarship places Pomponazzi at the head of the Alexandrist reading of Aristotle, after Alexander of Aphrodisias, against the Averroist and Thomist schools that found immortality in the text. His insistence that nature be explained by natural causes, and that the philosopher reason without borrowing the theologian’s conclusions, made him a marker — claimed by later writers as an early secularist, defended by others as a sincere believer keeping two domains honestly apart. The argument over his real mind is unlikely to close, because Pomponazzi built it to be unresolvable: the appeal to faith is either the device of a careful unbeliever or the conscience of a careful believer, and the text supports both readings because it was written to.

His naturalizing of wonders sets him within a cooler current of Renaissance thought, one that ran against the high tide of magical and Hermetic revival gathering in the same decades. Where Marsilio Ficino and his heirs were lifting the soul toward the divine and reading the cosmos as a web of living sympathies to be drawn on by the magus, Pomponazzi was explaining the marvelous down — into heavens that act by ordinary causation, bodies with hidden but natural powers, and minds whose imaginings can move matter. His nearest kin in this is Girolamo Cardano, the physician-mathematician whose catalogs of hidden causes and subtilitas shared the appetite for explaining the strange without the spirit-world, though Cardano kept far more of the occult cosmos than Pomponazzi would allow. The jurist Jean Bodin, a generation later, would name Pomponazzi among the dangerous naturalizers of demonic action and argue the opposite case with the full weight of the witch-prosecutor — a measure of how far the De incantationibus reached even before it was widely read.

He died at Bologna in 1525, his most dangerous book still in manuscript.

Texts, editions, and scholarship

The Tractatus de immortalitate animae (Bologna, 1516) is Pomponazzi’s only major work published in his lifetime; the Apologia (1518) and the Defensorium adversus Augustinum Niphum (1519) followed in the heat of the controversy. De incantationibus and De fato circulated in manuscript and were printed posthumously at Basel (1556 and 1567 respectively) by the reformer Guglielmo Gratarolo, an Italian Protestant in exile — a publishing history that itself records how unsafe the books were in Catholic Italy.

The standard English translation of the treatise on the soul is W. G. L. Randall’s, in the influential anthology Ernst Cassirer, Paul Oskar Kristeller, and John Herman Randall Jr. edited as The Renaissance Philosophy of Man (Chicago, 1948). The fullest critical-biographical study in English remains Martin L. Pine, Pietro Pomponazzi: Radical Philosopher of the Renaissance (Padua: Antenore, 1986); Paul Oskar Kristeller’s chapter in Eight Philosophers of the Italian Renaissance (Stanford, 1964) is the compact classic statement. The Italian foundation is Bruno Nardi, Studi su Pietro Pomponazzi (Florence: Le Monnier, 1965), which set the modern debate over his sincerity and his sources. The early modern reception, including the Lateran-Council backdrop and Nifo’s papal commission, is reconstructed in detail in Leen Spruit’s study of the Pomponazzi affair. For the older, still-useful English account — and the only one to render large parts of De incantationibus into English prose — see Andrew Halliday Douglas, The Philosophy and Psychology of Pietro Pomponazzi (Cambridge, 1910), now in the public domain. The naturalistic theory of religion in De incantationibus, and its long afterlife in the secular study of religion, is the subject of Juraj Franek’s “The Naturalistic Theory of Religion in Pomponazzi’s De Incantationibus” (2020).

→ Related: Girolamo Cardan · Jean Bodin · The Renaissance · Magic · Alexandrists · Aristotle · Immortality · Soul · Naturalism · Fate · Free Will · Miracle · Thomas Aquinas · Renaissance Magic · Renaissance Hermetism · Marsilio Ficino