Science is Not Enough:
Karl Stern, AI and the Vocabulary of the Soul*

Karl Stern, AI & the Vocabulary of the Soul

Every day we encounter articles warning of AI’s future dangers—but is machine learning really the threat? No. As the psychiatrist Karl Stern warned 71 years ago in “The Third Revolution,” the core problem is that intellectual elites have spent more than a century embracing a materialist view of reality: scientism über alles.

Stern, a Jewish psychiatrist who fled Nazi Germany and converted to Catholicism, diagnosed this delusion with prophetic clarity. In “The Third Revolution” and his spiritual autobiography “The Pillar of Fire,” he warned that when we reduce persons to mechanisms, it is not only bad philosophy, but has terrible consequences: we open the door to dehumanization in all its forms. The AI debate is the latest chapter in a story Stern witnessed firsthand: in Nazi Germany, human beings were reduced to specimens in a racist biological theory, their humanity ignored by a materialist worldview that saw them as nothing more than evil animals, “Untermenschen,” to be eliminated.

What Science Cannot Explain

What’s wrong with materialism? Why isn’t science enough? Stern identified the fundamental error: science operates legitimately on one plane of reality—the material, measurable, mechanistic plane. But when it claims this is the only plane, it fails on its own terms.

Consider Stern’s famous thought experiment. Imagine assembling a research team to study Beethoven’s Ninth Symphony. Physicists analyze the recorded sound waves, intensities and frequencies; psychologists investigate Beethoven’s childhood traumas and how he coped with deafness; sociologists try to establish a relation between his choice of Schiller’s Ode to Joy and the post-Napoleonic political climate; neurologists use functional MRI to map which brain regions are stimulated when a subject hears the choral movement of the Ninth.

Yet as Stern observes, “No matter how much data our scientific team compiled, it could not ‘explain’ a single bar of the musical experience we call the Ninth Symphony.” The problem isn’t insufficient data or inadequate instruments. The problem is categorical: aesthetic experience, meaning, and beauty exist on a plane that scientific measurement cannot access.

This isn’t a failure of science—it’s a consequence of the nature of reality. As Stern wrote, “Love and hate, joy and mourning cannot be quantified.” The scientific method requires measurement and quantification, but qualia—what humans feel, how they establish value and purpose, the depths of significance and meaning—intrinsically resist quantification. You can map every neuron, measure every hormone, track every electrical impulse—and still not capture what it means to choose just the right shade of red for Moira Shearer’s ballet slippers, to grieve a loss, or to love your child.

The same limitation appears across every domain that matters most to human life. Science can conduct surveys about aesthetic preferences, but it cannot tell us what makes Mozart objectively more beautiful than elevator music, or a Rembrandt superior to calendar art. As Stern points out, “there is no method in the social sciences which would help either to support or to deny this hierarchy of values.” “The question of intrinsic value—what makes one thing more beautiful than another—remains untouched.”

Science can map the neurological processes during moral decision-making, but it cannot ground moral obligation itself. Why should we sacrifice for others if we’re merely collections of atoms following physical laws? Stern observed that materialist philosophies, whether Freudian or Marxist, smuggle in moral imperatives that their own mechanistic systems cannot justify.

Fundamentally, science cannot answer “why” questions about purpose and meaning. It excels at describing mechanisms—how things work. But it cannot address teleological questions—why things exist, what their purpose is. As Stern asks pointedly: “Does anyone really believe that families are founded, orphans are cared for, the sick are tended to, cathedrals are erected, symphonies are composed—only because instinctual drives are blocked by society?”

These aren’t defects in the scientific method. They’re inherent limitations that reveal reality’s true nature: multiple planes of being, each requiring its own mode of knowing. Material reality is explained by empirical science. Meaning and value need philosophy and wisdom traditions as a contextual setting. Ultimate questions about existence and purpose require theology. The catastrophic error of scientism is claiming that only the material plane is real—that if science cannot measure it, it doesn’t exist.

Stern on AI

If Stern were alive today, he would recognize that all our concerns about AI follow from his warnings. Consciousness cannot be achieved through algorithms and computation—not because our computers aren’t powerful enough, but because self-awareness belongs to a different order of reality. Following philosophers like Roger Penrose and David Chalmers, Stern would point out that no amount of computational complexity can bridge the gap between syntax and semantics. And he would see AI companions—digital boyfriends and girlfriends marketed as substitutes for human relationship—as the ultimate degradation of personhood. Instead of buying a slave for intimacy, one purchases an algorithm, an entity without a soul.

Articles warning of AI dangers proliferate: economic collapse, energy crises, the death of creativity, educational devastation. The catalog of potential catastrophes grows daily—too many for this essay. But Stern would cut through the noise to the fundamental issue: AI has no soul and never will. Machine learning, no matter how advanced, can deal only with the material plane. And that’s not a technological limitation—it’s impossible ontologically.

The Catholic Answer: Persons, Not Mechanisms

Stern’s solution wasn’t to reject science but to take it as a way of partially understanding reality, an incomplete explanation. The Catholic intellectual tradition, drawing on Aristotle and Aquinas, has always insisted on what Stern called “multiple planes of being.” Material reality operates according to physical laws that science can study. But persons exist simultaneously on material, psychological, and spiritual planes—body, soul, and spirit united in a single being made in God’s image.

This view of science acknowledges what we all know from experience: consciousness cannot be reduced to computation, that meaning transcends mechanism, that persons are fundamentally different from things. As Stern wrote, “Newtonian light, the light of primary sensory experience, and the ‘metaphoric’ light of Platonists and poets and of Saint John—all these are realities, and they are not mutually exclusive. They exist on different planes.”

The practical implications are profound. Consider addiction recovery. Could an AI chatbot serve as a 12 Step sponsor? Technically, it could be programmed with all the right phrases, the approved responses, the standard wisdom of recovery programs. But it could never actually be a sponsor—because sponsorship requires what AI fundamentally lacks: empathy born of shared suffering, moral authority grounded in personal transformation, the presence of one wounded healer accompanying another. It requires a soul that has known brokenness and found grace. Machine learning can simulate the words, but it cannot provide the “God with skin,” the fellow addicts who make recovery possible.

Materialism fails everywhere it’s applied to persons. You cannot reduce love to oxytocin, beauty to preference patterns, moral obligation to evolutionary advantage, or human dignity to biological function. Rather than algorithms to be debugged, persons are embodied souls, created for communion with a personal God, bearing His image.

Living Beyond Scientism

We should use AI where it excels—as a tool for analyzing data, automating routine tasks, solving computational problems. But we must resist the temptation to let it invade domains that belong to persons: education that forms character, counseling that heals souls, relationships that constitute our humanity. The point here is that reducing processes involving personal relationships to algorithmic routines destroys what makes them valuable.

And we should reclaim the vocabulary of the soul. In an age that reduces persons to brain , consciousness to information processing, and love to neurochemistry, we need to speak again of spiritual realities: of souls created for eternity, of transcendent purposes, of communion with the divine. Not as poetry or metaphor, but as the most fundamental truth about what we are.

Conclusion

Karl Stern fled one materialist regime that reduced persons to specimens and lived to see others embrace the same philosophy in different forms. The AI panic is just the latest manifestation of the false philosophical assumptions he pointed out: that persons are mechanisms, that consciousness is computation, that science is enough.

It isn’t enough. It never was. And until we recover what Stern knew—that persons exist on multiple planes, that materialism destroys human dignity, that we are souls made for something more than mechanism—we’ll keep building better tools while losing our humanity.

The danger isn’t artificial intelligence. The danger is a philosophy that reduces natural intelligence—human consciousness, the soul—to nothing but a biological computer waiting to be replaced by a silicon one. Stern warned us seventy years ago. We need to listen now.

Note

This article was first published on The Catholic Thing; reprinted with permission.