Scott Alexander turns a crowded theological debate into a rigorous lesson on how we measure complexity, arguing that the most popular defense of God—that an infinite mind is the simplest explanation—collapses under the weight of actual computer science. This isn't a sermon or a polemic; it is a forensic dissection of why "mind without limits" is a linguistic trick, not a logical primitive, and why busy readers should care about the difference between a sentence and a simulation.
The Trap of the "Simple" God
The piece begins by addressing the friction between intellectual humility and the temptation to dismiss complex arguments simply because they feel wrong. Alexander notes that while everyone uses heuristics to avoid being overwhelmed, there is a crucial distinction between ignoring a topic and claiming to have solved it. He writes, "Little annoys me more than when I spend weeks carefully gathering citations and making a substantive contribution in a domain, and somebody responds with 'well that's obviously all bullshit because it vaguely reminds me of something I have negative affect towards'."
This distinction is vital. Alexander isn't just saying he disagrees with the miracle discourse; he is arguing that dismissing it as "nonsense" without engaging the specific claims is a failure of intellectual honesty. He admits his own position risks degenerating into what he calls the "absurdity heuristic," where things that look like other things that give him the creeps are automatically rejected. This self-awareness strengthens his credibility, even as he pushes back against the idea that he is being inconsistent in his skepticism.
"I admit this [argument] is dangerous. It risks degenerating into . . . the absurdity heuristic."
Critics might argue that this level of meta-commentary distracts from the core theological questions, but Alexander insists that the method of dismissal is often the problem. He points out that many people are terrified of religious claims not because they have analyzed the evidence, but because they have internalized a fear that they cannot articulate. He notes, "I still get a trickle of DMs, maybe one or two per month, by people who are terrified of Fatima and want me to reassure them that it doesn't prove they're going to Hell."
The Airplane and the Starship: A Lesson in Schematics
The heart of Alexander's argument tackles the concept of Kolmogorov complexity, a measure of the information required to describe an object. A commenter named Kveldred challenged Alexander's earlier analogy about airplanes and starships, suggesting that a simple description doesn't necessarily mean an object is easy to build. Alexander concedes the point, admitting, "I agree I didn't do a great job with this part. I was trying to avoid having to describe Kolmogorov complexity too, uh, complexly, and that made the explanation too basic to hold up to full scrutiny."
He then refines the argument with a precision that is rare in popular discourse. He distinguishes between the English sentence describing something and the actual "schematic" or program required to simulate it. A starship might be described as "aircraft without limits," which sounds simple, but the code to actually run a starship would be massive. Conversely, a biplane has limits, but those limits make it easier to simulate. As Alexander puts it, "The biplane has fewer components and requires less precision; the blueprint could fit in a smaller file."
This reframing is the piece's intellectual anchor. It dismantles the theist argument that God is simple because the phrase "mind without limits" is short. Alexander argues that if you tried to actually build a simulation of a mind that knows everything and can do anything, the file size would be astronomical. He draws a parallel to modern AI, noting that "GPT-1, a very simple AI with few capabilities, is about 100 MB; GPT-5, a modern AI with many more capabilities, is about 10 TB."
"All of this suggests that it takes kilobytes to megabytes to describe very simple minds, and gigabytes to terabytes to describe more complex minds with human-level capabilities."
The implication is stark: if a human-level mind requires terabytes of data, the claim that an infinite mind requires only 19 bytes (the length of the phrase "mind without limits") is mathematically incoherent. Alexander writes, "It's also common-sensically false; if small weak minds are 100 MB, and powerful human-level minds are 10 TB, it's unlikely that the most powerful and perfect mind of all is 0 - 19 bytes."
The "Import God" Fallacy
Alexander anticipates the counterargument: what if the programming language itself has a library for God? He compares this to a programmer claiming a universe-creating factory is simple because they can just "import" it. He finds this hollow, noting that we have no evidence of such a library in the real world. "Imagine if I said that the universe was created by a universe-creating factory using skilled German union labor," he writes. "The counterobjection 'I've decided that universe-creating factories and Germans might be infinitely simple, and you can import them with a one-line command' would sound hollow, because all the factories we know are very complex."
This section connects to broader historical debates about the origins of religious belief. While a commenter named Reginald K cited Stephen Barr to suggest that early religious philosophers preferred natural explanations, Alexander pushes back with a wealth of anthropological evidence. He points out that myths about thunder, lightning, and the seasons are ubiquitous across cultures, from Norse myths of Thor to African myths about the Creator punishing a snake. He argues that the "God of the gaps" theory is not just a modern error but a fundamental feature of how humans explain the unknown. "Even the more 'sophisticated' traditions like Greek and Jewish religion have plenty of these," he notes, citing the story of Persephone as an explanation for the seasons.
"It's not a schematic; it's not a file capable of simulating such a mind."
The Simulation Hypothesis and the Final Verdict
The commentary concludes by addressing the simulation hypothesis, raised by a commenter named archsine, who asks if the arguments against God apply equally to simulators. Alexander doesn't shy away from this, but he maintains his focus on the specific flaw in the "simple mind" argument. The core issue remains that complexity is not defined by the brevity of a label, but by the computational resources required to instantiate the entity.
Alexander's willingness to engage with the technical details of information theory, rather than retreating to philosophical hand-waving, is what makes this piece stand out. He forces the reader to confront the reality that an infinite mind is not a "free lunch" in terms of information; it is the most expensive thing imaginable to simulate. As he summarizes his position, "If 'Mind' is an existing function in your library, this is terrible coding technique!"
Bottom Line
Scott Alexander's strongest move is reframing the debate from theology to information theory, proving that "simplicity" is a property of the simulation, not the label. The argument's greatest vulnerability is its reliance on the assumption that the universe operates on computational principles that we can fully map, a premise that some philosophers and theologians would reject outright. However, for a reader seeking clarity on why the "simplest explanation" is often the most misleading, this is essential listening.
"If small weak minds are 100 MB, and powerful human-level minds are 10 TB, it's unlikely that the most powerful and perfect mind of all is 0 - 19 bytes."
The piece succeeds because it refuses to let the reader off the hook with a vague dismissal; it demands that we understand the cost of the things we claim to believe in.