Part 1: The System Revealed — Hermeticism and the Roots of Theurgy

“Forbidding to marry… giving heed to seducing spirits, and doctrines of devils.” — 1 Timothy 4:1–3

Building on the foundation already established through the work of Frances Yates, this section turns to further study, particularly the analysis of D. P. Walker Spiritual and demonic magic : from Ficino to Campanella. By the time the Hermetic texts had been translated and absorbed into Renaissance thought, they were no longer treated as relics of a pagan past, but had become a framework through which God, the cosmos, and man were reinterpreted.

At the centre of this shift was the idea of prisca theologia—the belief that a single, primordial theology existed before all religions (remain attentive to any interfaith dialogues). Under this assumption, the writings attributed to Hermes Trismegistus were no longer viewed as foreign, but as part of the same stream of truth. If Hermes was older than Moses, then what he taught could be received not as contradiction, but as confirmation. Thus systems involving cosmic powers, astral influences, and the mediation of spiritual forces were redefined, not as sorcery, but as knowledge of divine order.

This is where the issue becomes unavoidable.

The question is not whether these systems appeared pious, they often did. The question is that they introduced a framework in which man, through knowledge and technique, could approach spiritual power outside the command of God. What Walker shows is that this was not rejected, but transformed. What Scripture condemns became acceptable under new language. What had been pagan became “ancient wisdom.” What had been sorcery became “natural magic.”

The apostles did not teach methods of accessing spiritual forces or aligning with cosmic powers. They preached Christ, not as something to be mediated or manipulated, but as Lord. Yet here, under the authority of antiquity, another system entered, one claiming access to hidden knowledge and spiritual intermediaries.

It is this system, and the resistance to it, that must now be examined.

What is often overlooked in the narrative of Renaissance magic is that it was not universally embraced, nor was it accepted without resistance. Alongside those who sought to revive Hermetic and Platonic traditions, there arose a distinct and consistent opposition, one that rejected the entire framework outright, not as misunderstood wisdom, but as error rooted in spiritual deception.

This group, described by Yates as a coherent tradition, included figures such as Gian-Francesco Pico, Johann Wier, and Thomas Erastus. Though differing in background, they were united in their conclusions: that all forms of magic, regardless of how refined or philosophical they appeared, were either illusions or operations involving demonic forces. They did not accept the Renaissance distinction between “natural” and “demonic” magic. For them, such a division was artificial. The entire system, astrology, talismanic practice, invocation, and the supposed manipulation of cosmic powers, belonged to the same category of forbidden activity.

Their authority was not Plato, Hermes, or the so-called ancient sages, but Scripture. Where Ficino and his followers saw confirmation of divine truth in pagan sources, these men saw confusion, contradiction, and spiritual danger. They rejected the idea of prisca theologia entirely. What others praised as a primordial wisdom older than Moses, they identified instead as a continuous tradition of error, one in which idolatry, astrology, and magic were inseparably joined.

Gian-Francesco Pico expresses this with striking clarity. For him, the entire weight of pagan philosophy, no matter how vast or sophisticated, could not stand against a single truth drawn from the writings of Moses, the prophets, or the apostles. This was not merely a theological preference, but a total reversal of the Renaissance assumption. Where Ficino elevated Hermes as a source of ancient revelation, Pico reduced him to part of a corrupted system, one that, at best, borrowed fragments of truth, and at worst, propagated deception.

In this view, the figures celebrated as prisci theologi; Orpheus, Zoroaster, and others, were not bearers of divine wisdom, but originators of false religion. Orpheus, in particular, is treated not as a poetic theologian, but as a founder of idolatrous practice, one who gave form to the worship of false gods, what Scripture would identify as devils. Even the myths associated with him are reinterpreted accordingly. The descent into the underworld is no longer symbolic, but an example of necromancy, the attempted communication with the dead through illusion and deception.

This is not a minor disagreement over interpretation. It is a fundamental divide. On one side, the Renaissance magus, who sees in these traditions a path to divine knowledge and participation in the cosmos. On the other, those who see in the same practices the revival of idolatry, the invocation of spirits, and the continuation of what Scripture consistently condemns.

The importance of this opposition cannot be overstated. It demonstrates that the reinterpretation of magic as wisdom was not universally convincing, even in its own time. There were those who recognised that beneath the language of philosophy and antiquity lay a system that could not be reconciled with the authority of Scripture.

“And they worshipped devils, and idols of gold, and silver, and brass, and stone…” — Revelation 9:20

What one side called ancient theology, the other identified as something far older in a different sense, not a pure source of truth, but a persistent pattern of spiritual error, repeating itself under new names, yet retaining the same essential form.

Gian-Francesco Pico makes his position unmistakably clear when addressing the use of talismans and astrological images. Referring to figures like Apollonius, he identifies such practices not as philosophy, but as evidence of magic. He laments that even in his own time, people were having objects crafted under specific constellations, engraved with images, and worn with the belief that they could draw down power from the heavens.

His criticism becomes more pointed when he turns, without naming him directly—to Ficino. Pico condemns the writing of elaborate systems on astrological images and the attempt to obtain health, longevity, or influence through celestial means. Though Ficino tried to protect himself by claiming he was only reporting such practices and not endorsing them, Pico rejects this defence outright. Such disclaimers, he argues, are meaningless when the subject itself is corrupt. If something is truly good, it needs no excuse; if it is clearly false or dangerous, then to dress it in cautious language is not justification, but evasion.

For Pico, talismanic practice cannot be reconciled with truth. It is not misunderstood wisdom, but superstition, dangerous precisely because it presents itself under the guise of learning and piety. Even where he refrains from openly exposing Ficino, his judgment is clear: these practices threaten the integrity of Christian doctrine.

Importantly, Pico does not deny that such systems claim to work. His concern is not that they are impossible, but that they operate within a framework that cannot be trusted. The underlying theory, that the stars influence the world, and that the human imagination, words, and symbols can project or transmit power into external things, reveals a system in which spiritual force is treated as something that can be accessed, directed, and impressed upon matter.

This is the critical point. Whether described as “rays,” “spirits,” or “influences,” the principle remains the same: that unseen forces can be channelled through images, words, and intention to produce real effects in the world. From this foundation arise not only talismans, but the wider practices associated with fascination, incantation, and what would later be recognised as witchcraft.

Pico’s rejection, therefore, is not based on ignorance, but on recognition. He sees that beneath the philosophical language lies a system that attributes power to created things and to human technique in a way that stands in direct tension with the authority of God. What is presented as knowledge of nature becomes, in practice, a method of engaging with forces that Scripture does not sanction.

And it is precisely this, power sought through means outside divine command, that Scripture consistently condemns.

“And he had power to give life unto the image of the beast, that the image of the beast should both speak, and cause that as many as would not worship the image of the beast should be killed.” — Revelation 13:15 (KJV)

Council of Trent — Decree on the Eucharist, Canon 1

“If anyone denies that, in the sacrament of the most holy Eucharist, there are truly, really, and substantially contained the body and blood together with the soul and divinity of our Lord Jesus Christ… let him be anathema.” (Condemned)

Question:

Paul says of the Lord’s Supper:

“For as often as ye eat this bread, and drink this cup, ye do shew the Lord’s death till he come.” — 1 Corinthians 11:26

If Christ is already substantially present in the elements—body, blood, soul, and divinity—then what exactly are believers waiting for?

Why does Paul anchor the act in remembrance until His coming, if that same coming is claimed to occur repeatedly on the altar?

Is the Church proclaiming His absence until He returns—or asserting His presence in the bread before He comes?

I digress...

Pico’s argument against magical practice goes deeper than a simple rejection of superstition, it exposes the underlying mechanism being proposed. He acknowledges that the human imagination can have effects, but sharply limits them. At most, he argues, the inner impulses of the soul may influence the body or produce minor outward effects through physical means. Anything beyond this—any claim that the mind, words, or images can project power into the external world in a controlled and repeatable way, belongs to a different category altogether.

This is where the system he is opposing becomes clear.

Writers like Alkindi, and by extension Ficino, taught that the imagination, combined with words, sounds, and gestures, could operate outwardly, affecting reality itself. Words were believed to carry power, sounds to align with celestial forces, and speech to correspond with the movements of the heavens. In this view, the human voice was not merely expressive, but operative—capable of producing effects through its alignment with cosmic harmony.

Pico rejects this with force. If words have power because of their meaning, then they must be addressed to an intelligence, and the operation becomes an interaction with spirits. If they have power merely as sound, then there is no reason human speech should hold any special authority. Either way, the claim collapses into something untenable or something far more serious than its proponents admit.

And yet, in attempting to refute this system, Pico exposes the very tension at its core.

For the moment one allows that words, sounds, or formulas can produce effects beyond the natural order, a question immediately arises: by what power? If not by God directly, then through what agency? This is the difficulty he cannot fully escape. The same problem appears when considering sacred words used in religious rites, whether they possess power in themselves, or only by divine institution. Even here, the line between divine action and operative formula becomes dangerously thin.

This is the critical issue. The Hermetic and magical traditions rest on the assumption that unseen forces can be accessed and directed through technique, through imagination, speech, sound, and symbolic action. Whether described as rays, harmonies, or influences, the principle remains the same: that power can be channelled and applied through human method.

And this is precisely where the system crosses from philosophy into something else.

For once power is attributed to words, sounds, and gestures apart from direct divine command, the question is no longer whether something works, but what is being invoked. What presents itself as alignment with nature may, in reality, be engagement with unseen intelligences.

Scripture does not leave this ambiguous.

“Neither be ye desirous of vain things, as they also were… Neither let us tempt Christ…” — 1 Corinthians 10:6–9

What is described as harmony with the cosmos becomes, in practice, an attempt to access power through means that God has not ordained. And it is precisely this, power sought through words, symbols, and intention—that marks the transition from knowledge into sorcery.

The system being defended rests on the idea that sound, rhythm, and proportion are not neutral, but correspond to the movements of the heavens. Just as musical strings vibrate in sympathy with one another, it was believed that certain words, tones, and patterns could align with cosmic forces and produce real effects. In this view, speech and music were not merely expressive—they were operative, capable of interacting with unseen powers through hidden harmony.

But this creates a serious problem, and Pico himself cannot avoid it.

For if words and sounds truly carry such power, then the same logic could be applied to the most sacred rites of the Church, particularly baptism and the consecration of the Eucharist. If specific words, spoken in a certain form, produce a real effect, then the question arises: is this divine action, or is it something operating through the words themselves?

Pico attempts to escape this difficulty by suggesting that the words used in the sacraments may have no power in themselves, or that their effect depends entirely on a divine ordinance—a kind of agreement established by God. Yet even here, the issue remains unresolved. For within established theology, particularly in the teaching associated with Thomas Aquinas, the words of consecration are said to function as an instrument through which the transformation takes place. The formula itself—“This is my body… this is my blood”—is considered essential. Without those exact words, the act is invalid; with them, the transformation is said to occur, regardless of the personal state of the priest.

This reveals the tension at the heart of the issue.

On the one hand, there is a rejection of magical thinking—the idea that words and sounds can operate upon reality through hidden correspondences. On the other, there remains a structure in which specific words, spoken in a precise form, are understood to produce a real and immediate effect.

It is this overlap that makes the question so difficult—and so dangerous.

For once it is admitted that words, formulas, and sounds can effect change beyond the natural order, the distinction between divine command and operative technique becomes increasingly unclear. What is presented as sacrament begins to resemble mechanism; what is declared to be an act of God risks being understood as something triggered by human utterance.

And this is precisely the ground upon which the wider magical system stands.

Like Gian-Francesco Pico, Johann Wier rejects the entire idea of prisca theologia, not as misunderstood truth, but as a continuous stream of superstition and deception from which later magic developed. But Wier goes even further. Writing from a strongly anti-Catholic Protestant position, he does not merely criticise pagan sources, he begins to turn the same scrutiny toward elements within Christianity itself.

For Wier, what others called ancient wisdom was not divine at all, but diabolical in origin. Even the Sibyls—figures some within the Church had treated with near-scriptural authority, he dismisses as instruments of deception. According to him, the Devil himself could have supplied them with fragments of truth, even prophecies drawn from the Old Testament, not to reveal God, but to mislead later generations. This raises a disturbing question: if something contains truth, does that make it divine—or can truth itself be used as a vehicle for deception?

Wier’s view of the ancient world follows the same pattern. The Greek philosophers who travelled to Egypt did not, in his eyes, recover a lost divine theology—they learned corrupted practices, forms of magic dressed in religious language. What the Renaissance celebrated as a transmission of wisdom, he interpreted as the spread of error.

Importantly, Wier does not deny the reality of what is being described. He does not argue that magic is imaginary in the sense of being harmless. On the contrary, he believes it is deeply real—but its source is not God. The effects attributed to witchcraft and magical practice, he argues, are largely the result of demonic influence acting upon the mind, producing illusions and deceptions. The power is real, but the manifestation is false.

This leads to a striking position. Wier famously opposed the burning of witches—not because he believed magic to be innocent, but because he saw many accused as victims rather than agents. In his view, they were deceived, manipulated, and used. Yet he draws a clear line when it comes to learned magicians—those who knowingly engage with such practices. These, he suggests, are not merely deceived, but complicit. If a person knowingly seeks power through these means, what exactly are they entering into?

He also reinforces earlier arguments against the mechanics of magic. Following Pico, he rejects the idea that words, sounds, or images possess inherent power. Natural things may reflect the influence of the heavens, but artificial constructions—talismans, engraved images—cannot draw down power on their own. If they appear to do so, then the operation is not natural at all, but spiritual, and therefore involves another agency. The question then becomes unavoidable: if such power is not from God, from where does it come?

Wier’s critique extends even to figures long respected within tradition. Where others attempted to excuse authorities like Albertus Magnus, Wier openly condemns them for involvement in talismanic practices. Ficino himself, though acknowledged as learned, is placed within the same stream of error.

But perhaps the most revealing aspect of Wier’s position is this: he identifies not only pagan magic as dangerous, but also what he sees as magical elements within Christianity. His aim is not simply to reject external practices, but to strip religion of anything resembling ritual power, formula, or mechanism. This brings him into direct tension with Catholic theology, especially in relation to rites, words, and ceremonies.

And here the issue sharpens.

For if the same structure appears in both—words, formulas, rites, and the expectation of real effect—how is one to distinguish between divine action and forbidden practice? At what point does ritual become mechanism? And if power is attributed to words, objects, or actions, is this faith, or is it something else, operating under a different name?

Wier’s answer is severe: what appears as sacred operation may in fact be deception. The form may remain religious, the language may remain pious, but the underlying structure must be tested. For if it mirrors the very practices Scripture condemns, then no appeal to antiquity, authority, or tradition can make it safe.

Wier’s critique does not stop at pagan magic—he extends it into the practices of the Church itself. What many considered sacred rites, he regards as superstitious, and therefore at least potentially demonic. This includes exorcisms, the use of Scripture or divine names as healing formulas, relics used for cures, written amulets, and even the consecration of bells and images. In each case, the concern is the same: that spiritual power is being attached to objects, words, or actions in a way that resembles the very practices condemned elsewhere as magic.

His position forces a difficult distinction. If magic produces effects only in the imagination, delusions shaped by belief—then religion, to remain pure, must also avoid any claim of outward, mechanical effect. Its operation must be inward: a change of heart, an illumination of the mind. In this framework, the difference between magic and true religion lies in this, magic claims visible or external results, while true religion operates within.

But even here, the ground begins to shift.

For in reducing both magic and religion to inward effects shaped by belief, Wier brings them dangerously close together. If magical words have no power in themselves, but appear effective because of belief, then what of religious words? Are they fundamentally different, or are they operating through the same mechanism, only under a different name?

Wier attempts to resolve this by drawing a line: sacred words are effective only by the grace of God, while magical words deceive through belief placed in the devil. Yet the structure begins to mirror itself. On one side, belief disposes the mind toward God; on the other, belief opens the door to deception. But if both depend on the disposition of belief, what ultimately separates them?

This tension becomes even clearer in his treatment of superstition. Drawing on earlier writers, he acknowledges that strong belief—even when false—can appear to produce effects. A person deeply convinced of something may experience what seems like transformation or power, not because it is true, but because belief itself shapes perception and experience. This raises an unavoidable question: if belief alone can generate the appearance of power, how is one to distinguish between true spiritual action and illusion?

Wier tries to answer this by pointing to outcomes. Practices such as excommunicating locusts or baptising bells can be tested—do they produce real, observable results? If not, they are exposed as superstition. But this standard cannot be applied everywhere. Not all claims of spiritual power are so easily measured.

And so the problem remains.

If rites, words, and objects are used with the expectation of producing spiritual effects—whether outward or inward—how does one determine their source? At what point does faith become credulity? When does devotion become mechanism? And if the structure of an act mirrors what is elsewhere condemned as magical, can its intention alone make it safe?

These are not abstract questions. They strike at the boundary between true worship and imitation—between what comes from God, and what only appears to.

Wier attempts to draw a final distinction between true religion and magic by appealing to the miracles of Christ. For him, the difference lies in their effects: the works of Christ are beneficial—healing, restoring, giving life—whereas the works of magic are either empty displays or actively harmful. On this basis, he accepts the miracles recorded in Scripture while rejecting magical and even some contemporary religious claims to healing.

But this distinction raises a serious difficulty.

If the criterion is simply that one produces good and the other harm, then why reject all later claims of religious healing? On what basis are some acts accepted as divine while others are dismissed as illusion or deception? If the structure appears similar, words spoken, acts performed, effects expected—what ultimately separates them? The line begins to look less stable than it first appears.

This exposes a deeper problem: the attempt to remove all traces of “magic” from Christianity proves nearly impossible. The tension is already present from the beginning. Once the question of power, how it operates, how it is mediated, how it is recognised—is raised, it cannot be easily confined.

Thomas Erastus continues this line of attack, but with greater intensity and consistency. Like Pico and Wier, he rejects the theoretical foundations of magic, but he goes further, grounding his arguments not only in theology but in observation and experience. Where earlier writers argued philosophically, Erastus appeals to what can actually be seen and tested, challenging many of the assumed “facts” on which magical systems were built.

At the same time, his position is shaped strongly by his theology. Scripture, interpreted as literally as possible, becomes his highest authority—not only in matters of faith, but in understanding the natural world itself. This leads him to reject one of the central assumptions of Renaissance magic: that celestial bodies, or intelligences associated with them, transmit forms and powers into the world below.

Against this, Erastus argues directly from Genesis. If plants were created before the stars, then their nature cannot derive from celestial influence. If living beings reproduce according to the order given by God, then their form does not descend from the heavens, but is given and sustained by God alone. The stars may provide light and contribute to the conditions of life, but they do not impart essence, power, or form.

This strikes at the heart of the magical system.

For if the heavens are not the source of hidden powers, then the entire structure of astral influence collapses. There are no celestial intelligences transmitting force, no planetary spirits shaping reality, no cosmic chain through which power descends into matter. What remains is creation under God, not a system to be accessed or manipulated.

And this leads to the central question:

If God alone is the giver of form, life, and power, then what is being engaged when systems claim to draw influence from elsewhere? If power is sought through stars, words, images, or rites, outside the direct command of God—what is its true source?

For Scripture is clear:

“The things which the Gentiles sacrifice, they sacrifice to devils, and not to God.” — 1 Corinthians 10:20

The issue is no longer philosophical, but spiritual. Not whether such systems are coherent, but whether they are lawful. Not whether they appear to work, but what stands behind them.

Erastus pushes the rejection of magical theory even further by attacking one of its central assumptions: that spiritual intermediaries—whether angels, intelligences, or planetary forces—transmit power into the world. He refuses this entirely. To suggest that such beings govern or distribute forms in creation, he argues, is nothing less than a return to polytheism—a multiplication of lesser “gods” placed between man and the Creator.

What is this, he essentially asks, but the invention of subordinate deities, entrusted with powers that belong to God alone?

From this position, he takes a decisive step. While he does not deny that nature contains hidden qualities or effects not immediately understood, he refuses to explain them through astrology or celestial influence. Instead, he insists that all such properties depend solely on the will of God. This removes the entire framework of cosmic mediation. There is no chain of influence descending from the stars, no intelligences shaping reality, only creation governed directly by God.

The consequence of this is significant. If these qualities come from God alone, then they cannot be predicted, manipulated, or systematised through speculative philosophy. They must be observed. This line of thinking moves toward what would later become empirical science: knowledge based not on hidden correspondences, but on experience. Yet even here, Erastus keeps Scripture as the final authority, not human theory.

Having dismantled the astrological foundation, he then turns to the effects attributed to magic itself. Here his position is absolute. All such effects, he argues, are either natural and misunderstood, or they are illusions produced by demons. There is no middle ground. What appears extraordinary is either ignorance or deception.

He does allow, in appearance, a narrow category of “natural” investigation, practical experiments that seem remarkable but are in fact explainable. Yet even this concession collapses under scrutiny. For if something is truly marvellous, he concludes, it must be the result of deception; if it is not deceptive, then it is not magical at all. In other words, magic as a real, operative system cannot exist without involving illusion or demonic influence.

In his broader critique, Erastus identifies a continuous tradition of magical thought running through figures such as Avicenna, Alkindi, Ficino, and others. What unites them is the belief that the imagination, often in conjunction with celestial forces, can produce real effects beyond the self. Whether described in terms of “rays,” “spirits,” or direct mental power, the principle remains the same: that human thought can act outwardly upon the world.

Erastus rejects this entirely. While he accepts that the imagination can affect the body and mind—producing psychological or physical responses—he denies that it can extend beyond the individual. The idea that a mental image could leave one person and enter another, or act upon external reality, he dismisses as irrational.

This is the decisive break.

For if the imagination cannot project outward, if the stars do not transmit power, and if no spiritual intermediaries govern creation, then the entire structure of magical operation collapses. What remains is a stark choice: either natural processes misunderstood, or deceptive influences masquerading as power.

And again the question returns:

If such effects are experienced—if people believe they are healed, influenced, or transformed—what is the source? If not God, and not nature, then what?

Scripture gives its own answer:

“Even him, whose coming is after the working of Satan with all power and signs and lying wonders.” — 2 Thessalonians 2:9

The issue is no longer whether these systems are coherent, but whether they are lawful—and whether what appears as power is in fact truth, or deception.

Erastus grounds much of his rejection of magic in observation and experience. He challenges widely accepted claims directly, even suggesting that supposed phenomena—such as physical effects attributed to certain conditions or influences, could be tested and disproven. For him, many of the classic examples used to support magical theory simply do not withstand scrutiny.

At the same time, he does not deny that people experience real effects. But he reinterprets them. What others attribute to magical power, he explains either as natural processes or as deception. In cases where individuals believe they have caused harm through occult means, he argues that they are being misled—persuaded by evil spirits into thinking they possess power they do not actually have. The effect may be real, but the agency is false.

This leads him to a strict position: the human imagination cannot project power outward into the world. While it may affect the body—producing psychological or physical responses—it cannot act beyond the individual. The idea that thoughts, images, or internal “spirits” could leave one person and influence another, or alter external reality, he rejects as impossible. Once separated from the body, these so-called “spirits” would have no direction, no power, and no continuity.

He further argues that the images formed in the mind are merely representations—shadows, not forces. They can signify or reflect, but they cannot produce real effects. In other words, imagination may shape perception, but it cannot act as an instrument of power.

Yet here again, a tension appears.

For while Erastus denies that imagination can act outwardly, he still accepts that it can produce real effects within the body and mind. This creates an inconsistency: if imagination can influence internal states so powerfully, on what basis is its outward action dismissed entirely? His arguments begin to strain under their own weight.

When applied to religion, this position becomes even more revealing. Erastus insists that religious words and ceremonies possess no inherent power. They do not act upon reality, nor do they produce effects beyond representation. Their purpose is symbolic—to instruct, to remind, to bring order and clarity, especially for those who require visible forms to aid understanding.

This strips religion down to its barest structure.

If words do not effect change, if ceremonies do not mediate power, then religion becomes inward and intellectual—centred on understanding rather than operation. But this raises further questions. If sacred words do not carry power, why are specific forms preserved? If ceremonies are only symbolic, why are they treated with such seriousness? And if everything is reduced to representation, what remains of the claim that God acts through these means?

Erastus attempts to hold his position by appealing to Scripture alone as the final authority. Yet even here, the tension persists. For Scripture itself contains accounts of real acts, real power, real intervention. How are these to be understood if all mechanism is rejected?

In seeking to remove all traces of magic from religion, Erastus arrives at a stark conclusion: either religion is purely inward, dependent on faith and understanding alone, or it risks adopting structures that resemble the very practices it seeks to reject.

And so the question sharpens once more:

If words, rites, and symbols are said to have no power, then why are they used as though they do? But if they are believed to produce effects, then by what authority, and through what power—do they operate?

Erastus attempts to preserve a distinction between divine miracles and magical effects by insisting that the miracles recorded in the New Testament are real, while magic is deceptive. But when pressed, his reasoning rests on a single foundation: Scripture says they are from God, and therefore they are true. Beyond this, he offers no independent criterion.

This creates an immediate problem.

For Scripture itself records events that resemble one another outwardly but differ in source. In the confrontation between Aaron and the magicians of Pharaoh, both sides produce signs. Erastus is forced to conclude that Aaron’s acts were real—because they came from God, while the magicians’ were illusions. Yet the distinction is not obvious from the event itself, but imposed afterward. The question remains: if two acts appear similar, how is one to discern their origin?

This tension becomes even sharper in his attack on Ficino.

Drawing from earlier traditions, Ficino taught that higher spiritual intelligences—linked to the heavens, could influence the human soul. Through preparation, alignment, and devotion, a person could receive these influences and be elevated, even to the point of performing extraordinary works: visions, prophecies, and what appeared to be miracles. The process required making the body and mind receptive—harmonising with the cosmos, directing the will toward these higher forces, and cultivating faith, love, and expectation.

In this system, the boundary between human and divine action begins to blur.

Ficino goes further still, suggesting that the human soul, when properly aligned, might perform works as marvellous as those attributed to the heavens themselves. He even invokes the words of Christ—faith that moves mountains—as support for this idea.

To Erastus, this is not insight, but presumption.

He sees in it a dangerous elevation of human capacity, a system in which man, through preparation and belief, seeks access to powers not granted by God. What Ficino presents as spiritual ascent, Erastus interprets as the influence of other intelligences, what he identifies not as divine, but as demonic.

And here his judgment is uncompromising.

For him, the Platonists are not merely mistaken, but engaged in something far darker. Their pursuit of higher knowledge, their openness to spiritual influence, their use of ancient wisdom—all of it, he argues, places them in continuity not with divine truth, but with the traditions of pagan religion. What they call illumination, he calls deception. What they call wisdom, he calls corruption.

The issue, once again, is not whether power is present—but its source.

If extraordinary works can be produced, if visions, prophecies, apparitions and signs appear, how are they to be judged? By appearance? By effect? Or by authority?

Erastus returns to a single answer: only what is grounded in the Word of God can be trusted. Everything else—no matter how elevated, how ancient, or how convincing—must be treated with suspicion.

And the question presses further:

If a system teaches that man can prepare himself, align himself, and receive power that produces signs and wonders—does this confirm its truth, or does it reveal its danger?

Erastus’s attack on Ficino is not measured—it is forceful, even aggressive, placing him alongside figures he considered deeply suspect, such as Pomponazzi and Paracelsus. To Erastus, these men represented different expressions of the same underlying problem: a willingness to blur the boundary between true religion and systems that opened the door to spiritual error.

Pomponazzi, in his view, had drifted so far into philosophical speculation that his Christianity became questionable. Paracelsus, meanwhile, he saw as unstable and theologically reckless. By associating Ficino with these figures, Erastus signals that the issue is not isolated ideas, but a broader movement, one that, despite its intellectual refinement, carries serious religious danger.

But Erastus’s concern is not merely guilt by association. Even taken on his own terms, Ficino’s work appears to him deeply troubling. The magic described in De Vita may attempt to present itself as natural or harmless, but it stands on uncertain ground. Elsewhere, Ficino speaks more openly about spiritual intermediaries and the ways in which they might be attracted or engaged. For Erastus, this is enough to raise suspicion. What is presented as philosophy begins to resemble an attempt to reintroduce forms of pagan religion, what he sees as a revival of ancient, idolatrous systems under new language.

This becomes especially clear in his critique of Ficino’s theory of words and sound. Ficino had suggested that words, when arranged in harmony with planetary influences, could attract certain forces—much like combining substances produces effects in the physical world. Erastus rejects this outright. If words truly had natural power, he argues, then language would not be conventional—everyone would instinctively speak the same way. The fact that speech varies proves that its meaning is assigned, not inherent.

From this, he draws a stark conclusion: any apparent power in words, especially in incantations, cannot be natural. It must come from another source. The use of obscure or foreign words, particularly in ritual contexts, only reinforces this suspicion. If they seem to produce effects, it is not because of their structure or sound, but because they are directed toward, or interpreted by, unseen intelligences.

Here the issue sharpens again.

If words, sounds, or formulas appear to produce effects, and those effects cannot be explained naturally, then what is responding? Who understands these words when they are meaningless to the speaker? And if the operation involves supplication or command, to whom is it addressed?

Erastus traces this line of thought back to the Platonists, whom he accuses of introducing a framework in which the world is governed by hidden sympathies and a universal soul—ideas that allow for the possibility of manipulating reality through harmony and correspondence. Ficino, in adopting this framework, is seen not as a cautious thinker, but as one who has absorbed and extended it.

Even when Ficino expresses hesitation, suggesting that such practices might involve deceptive spirits—Erastus does not take this as caution, but as confirmation. The doubt itself reveals the danger. If the system cannot clearly distinguish between natural influence and spiritual deception, then it stands on unstable ground.

And so the charge is not merely that Ficino was mistaken, but that he was engaging with ideas that risked reintroducing precisely what Scripture condemns: a system in which power is sought through words, harmonies, and intermediaries, rather than through obedience to God.

The question, once again, presses forward:

If words can attract influence, if sounds can draw down power, and if unseen forces respond to human action—then what is the nature of that response? And how is it to be distinguished from the very practices that Scripture forbids?

For it is not the appearance of wisdom that determines truth, but the source from which it proceeds.

Erastus’s critique of Ficino is not without substance, even if at times it is exaggerated or unfairly presented. In one instance, he selectively quotes Ficino in a way that suggests all such practices involve demonic deception, while omitting the broader context. In that fuller context, Ficino does acknowledge forms of magic that are openly demonic—both harmful and seemingly beneficial—and explains them in a traditional way: that those who believe they are controlling spirits are in fact being deceived by them.

But this explanation is not applied by Ficino to his own system.

Rather than dismissing all such operations, Ficino distinguishes his practice from what he considers overtly demonic magic. He argues that it is possible, through natural means, to draw in life-giving influences from the cosmos, from the stars (angels) and the living structure of the world—much as a physician draws out healing properties from nature. In this way, he presents his system not as summoning spirits, but as working within a living, interconnected creation.

Yet this distinction does not remove the problem—it exposes it.

For even while warning about deceptive spirits, Ficino continues to describe methods by which unseen influences may be attracted, received, and applied. The boundary between what is called “natural” and what is recognised as spiritual becomes increasingly thin. If the world is alive with forces, if the stars transmit power, and if human action can draw these influences down, then the question remains: what exactly is being engaged?

This is precisely where Erastus presses his criticism.

Even if Ficino attempts to distance himself from overtly demonic practices, the framework he operates within leaves room for them. The same system that allows for benign influences also allows for deceptive ones. And Ficino himself appears aware of this, acknowledging the existence and activity of such spirits, even while continuing to describe methods that could, intentionally or not, involve them.

The result is a tension that cannot easily be resolved.

What presents itself as a refined and philosophical form of “natural” magic remains closely connected, in principle and structure, to practices that are openly acknowledged as involving spiritual deception. The difference is not in the mechanism, but in the interpretation.

And this is the critical point.

If the same system can be described as natural, spiritual, or demonic depending on how it is framed, then the distinction is not secure. What appears harmless may not be so. What is presented as drawing from the life of the cosmos may, in reality, open the door to something else entirely.

If angels and demons are responsible for governing the world, then every visible effect—storms, diseases, events—can be attributed to their activity. In such a system, magic is not an illusion; it is real. But it is real because it is demonic. There is no neutral ground. No “natural magic.” No harmless philosophy. Every attempt to manipulate forces, influence nature, or access hidden powers becomes, by definition, an interaction with spirits.

And this is precisely why Bodin reacts so strongly.

His greatest fear is not simply magic itself, but what he sees as a far more dangerous development: the Neoplatonic and Hermetic attempt to justify it. These thinkers do not openly serve demons—they claim to ascend toward God through a structured universe, a chain of being linking the material world to the divine. Through herbs, metals, images, hymns, and rituals, they attempt to draw spiritual forces downward and rise upward through them.

Bodin sees this as a profound deception.

He describes it as an impiety hidden beneath philosophical language—a system that pretends to unite heaven and earth, but in reality constructs a ladder of intermediaries: spirits, “lesser gods,” planetary powers. Instead of coming directly to God, it builds steps—degrees—through which man attempts to ascend.

And against this, he invokes a striking principle:

God has not permitted such a system of ascent. Man is not to climb through intermediaries, nor to construct pathways to the divine through created things. He must come directly to God, through Christ.

This is where Bodin’s critique strikes at the heart of Renaissance magic.

For what the magi call divine philosophy is, in his eyes, a disguised form of idolatry. Not because it openly worships demons, but because it seeks God through created powers—through forces, symbols, angels and spiritual hierarchies that stand between man and the Creator.

He applies this critique directly to the practices circulating in his time.

The use of planetary magic—engraving symbols on metals under specific astrological conditions, combining them with plants, stones, animals, and hymns—is, for Bodin, nothing less than ritual engagement with spiritual entities. The invocation of Orphic hymns, the construction of talismans, the alignment with planetary forces—these are not philosophical exercises. They are acts directed toward spirits.

And even more strikingly, Bodin recognises the danger in something often overlooked: words.

He believes that words, especially sacred ones, carry power—but that this power operates through spiritual agency. Demons, he argues, respond to specific formulas, to particular phrases, to certain invocations. This is why, in his view, magical practices often rely on precise words, names, and sounds.

But this raises a question he cannot escape.

If words can produce effects through spiritual mediation—if specific phrases, spoken in the right way, bring about supernatural results—then how is one to distinguish between true religion and superstition?

Bodin attempts to answer this by restricting legitimacy to what he considers pure monotheistic worship. Only the Hebrew Psalms, directed to the one God, are acceptable. All other hymns—whether to pagan gods, intermediaries, or even figures venerated within Christianity—he places in the same category: directed toward created beings, and therefore spiritually dangerous.

And here his critique becomes especially severe.

He does not limit this judgment to paganism. He extends it to what he sees as the veneration of figures within Christianity itself. Any system that directs attention, invocation, or reverence toward beings other than the one transcendent God risks becoming indistinguishable, in practice, from the very idolatry it claims to reject.

This is the paradox at the centre of Bodin’s position.

He rejects magic because it engages with spirits. He rejects Hermetic and Neoplatonic philosophy because it attempts to reach God through intermediaries. But in doing so, he also exposes a deeper issue: that once a system allows for mediated access to divine power—whether through images, words, rituals, or spiritual hierarchies—the boundary between true worship and spiritual manipulation becomes dangerously unstable.

And this is precisely the tension that runs through the entire Renaissance encounter with magic.

For what some called ancient wisdom, others recognised as a system of spiritual mediation—one that, however refined its language, operated within the same structure: man reaching beyond what has been revealed, seeking power, access, and ascent through means that Scripture never authorised.

Bodin draws a sharp contrast between what he considers true worship and what he sees as its corruption. The Psalms of David, directed to the one God, represent for him a form of worship grounded in genuine monotheism. In contrast, the hymns of Orpheus—so valued by Renaissance magi—are, in his view, not merely poetic or symbolic, but function as a kind of liturgy addressed to multiple spiritual powers. What is presented as ancient wisdom becomes, for Bodin, a structured system of invocation directed toward spirits, and therefore fundamentally demonic.

His position on astrology follows the same pattern of guarded acceptance and firm limitation. He does not entirely reject celestial influence; he allows that the stars may have some role in the natural order, particularly in areas like medicine. However, he rejects the idea that the stars can be used to predict events with precision or to govern human destiny. The reason is significant: the world, in his view, is not governed by the stars alone, but by countless unseen spiritual beings—angels and demons—whose actions cannot be reduced to visible celestial movements. To rely on astrology as a complete system of knowledge is therefore to ignore the far more complex and hidden spiritual reality.

Even so, Bodin warns that astrology carries a deeper danger. It can easily become a gateway.

When taken beyond its limited, “legitimate” use, it leads directly into the world of magical practice. The attempt to read, align with, or harness celestial forces becomes the first step toward something more serious—the belief that man can draw down or even compel higher powers through natural means. This, for Bodin, is where the boundary is crossed.

He strongly rejects the claim, associated with figures like Pico, that so-called “natural magic” is simply an extension of natural philosophy. To him, this is not harmless science—it is a trap. It presents itself as the study of nature, but in reality it becomes a means by which spiritual forces are approached under the guise of knowledge.

And this is his central warning:

What appears as refined philosophy may in fact be a subtle form of spiritual deception. The language of nature, harmony, and cosmic order can conceal a deeper ambition—to access and influence powers beyond what has been permitted. And once that step is taken, the system no longer remains within the bounds of natural inquiry. It becomes a pathway into the very practices it claims to avoid.

In this way, astrology is not the endpoint, but the entrance. What begins as observation of the heavens can end in the belief that those heavens, and the forces behind them—can be reached, influenced, or even compelled.

And for Bodin, that is precisely where philosophy turns into impiety.

What emerges from these critiques is not confusion, but clarity. Across different traditions—whether Protestant, Catholic, or otherwise—there was a shared recognition that what presented itself as philosophy often concealed something far more serious: a system built on mediation, on unseen forces, and on the attempt to access power beyond what God had revealed.

They disagreed on many things. But on this, they converged: that behind the language of harmony, nature, and ancient wisdom lay a structure that could not be safely separated from spiritual danger.

The question, then, is not whether this system existed, nor whether it was recognised. The question is what became of it.

For it was not removed. It was absorbed.

In the next part, this will be examined further, tracing how these ideas moved beyond theory into influence, power, and practice, and how they continued within the very institutions that claimed to oppose them.