by Warren Deferbrache
I cannot claim this with certainty—there is simply no way to prove it one way or the other. And truthfully, I arrived at this conviction reluctantly, after decades of wrestling with the question. Yet in all my years of living and observing, I have encountered nothing—not a single shred of evidence—that persuades me we are anything more than our bodies and brains. No soul. No spirit. No essence that persists beyond death, and nothing that preceded our birth. We are, it seems, entirely physical beings.
My journey began in a religious household in Indiana, where my parents raised me as Methodist. My mother passed away several years ago, but my father still attends church faithfully. Church, however, held no appeal for me. I found the services tedious and the lessons unconvincing. By thirteen, I had pestered my parents relentlessly enough that they finally relented and let me stay home on Sundays.
Years later, a gymnastics coach I greatly respected drew me into the Charismatic movement—a fervent, ecstatic branch of Christianity focused on direct spiritual experience. It’s a long story, one I may tell in full someday. But the abbreviated version is this: I spent several years fully immersed in that world. We prayed with intensity. We fasted. We prayed some more. Yet in the end, I could discern no meaningful difference between those who poured their hearts out in prayer and those who didn’t. The faithful didn’t seem happier, healthier, or more successful than the secular. More troubling still, I found that religion didn’t make people demonstrably better than a solid ethical framework would. And the more I examined my faith, the more I accumulated questions about God itself—about what a truly infinite being would even be, or how it could resemble us in any way. I began to see the Bible not as revealed truth but as a collection of contradictions, ancient prejudices, and outdated moral codes. Other religions, insofar as I understood them, seemed similarly flawed.
These are weighty subjects, the kind that spark conversations that can last into the night. But my central point is this: I believe we likely have only one life—one precious, finite existence—and that we are nothing more or less than what our brains and bodies make us. Of course, that’s not the whole picture. We are also products of our upbringing, our culture, our circumstances. We are shaped by nature and nurture alike. This interplay between the biological and the biographical is profound and deserves serious consideration.
So why do I hold this view? The most compelling reason is this: when the brain is severely injured, the person changes. Their personality shifts. Their very sense of self can become unrecognizable. If we truly possessed an immortal soul independent of the physical body, such damage shouldn’t cause these transformations. Yet it invariably does. I’ve heard all the theological workarounds—that the soul is tethered to the brain during life and freed only in death, and so forth. But Occam’s Razor applies: the simpler explanation is usually the correct one. The simple answer is that we evolved like all other creatures on Earth, and we are subject to the same fundamental rules. We don’t believe bacteria ascend to heaven or that tardigrades—those charming microscopic animals that resemble tiny bears—get reincarnated. Well, most of us don’t, anyway.
Medical literature offers haunting case studies. There is the famous story of the man impaled through the skull by an iron tamping rod, who survived but emerged as a fundamentally different person—irascible where he had been genial, reckless where he had been cautious. His very essence had been altered by the damage. Then there are the invisible wounds: soldiers returning from combat with PTSD, their personalities reshaped by trauma, their capacity for joy and connection permanently diminished. These are not spiritual crises; they are the results of physical trauma to the brain.
You might ask: why include the body as well as the brain? There was a time when I might have said the brain alone defines us. But I’ve come to see that the body and mind are inseparably intertwined, engaged in constant conversation. Hormones flood our systems—adrenaline sharpening our senses in moments of danger, cortisol clouding our judgment during stress. The food we eat shapes our thoughts in ways we barely understand. A blood sugar crash can plunge us into despair; a good night’s sleep can restore our sense of possibility. There is no separating the physical from the mental. We are integrated systems, body and brain together.
Let’s be honest: it’s a bitter pill to swallow. We are born into consciousness, we accumulate knowledge and skills and memories, we love deeply and build meaningful connections—and then it all ends. The light simply goes out. It’s small wonder that humans have invented religions and mythology to deny this reality, to craft elaborate stories in which death is not an ending but a transition. Yet I suspect most people recognize the truth at some level, even if they won’t admit it to themselves.
But why should we face this truth? Because I believe our species must mature beyond hiding from reality. When we allow ourselves to deny one truth, we make it easier to deny others. We muddy our thinking. We surrender our capacity for clear reasoning and fall prey to illusions and control. There’s a cowardice in it, too. When we believe in things without evidence, we open a door we can never fully close. We erode our own commitment to truth. That path leads to all manner of false beliefs—not just religious ones, but conspiratorial ones, ideological ones, magical thinking of every variety. We give up our hard-won right to demand evidence, and in doing so, we invite a chaos of contradictions into our minds.
What we need instead is to build our lives on evidence—on observation, on reason, on intellectual honesty. Yes, there are mysteries. There will always be unanswered questions at the frontier of human knowledge. So why is it so difficult to simply say, “I don’t know”? This honest admission is far healthier than constructing elaborate mythologies or cowering in fear of the unknown. It is the foundation of both intellectual integrity and genuine peace of mind.
There is health, too, in turning toward our feelings and thoughts rather than away from them. We must learn to sit with discomfort, to acknowledge our fears and sorrows, to integrate them into who we are. This is the true path to psychological well-being. Running from what frightens us only amplifies the fear; it festers in the darkness. We must be willing to face reality—difficult as it is—not just for our own sake, but for the future and for our children’s sake. We owe them a world built on truth, not comforting illusions.