I used to think I could argue someone into the kingdom.
I was good at it, too. Or at least I thought I was. I could dismantle an Arminian’s position in fifteen minutes. I could corner a materialist with the problem of consciousness. I could cite chapter and verse until the other person ran out of answers, and I would walk away from those conversations thinking I had won something. That the truth had advanced. That I had done my part.
And then I would watch the person go right back to believing exactly what they believed before the conversation started. Every time. Without exception. I could win the argument and lose the person, and the score never changed. Not once.
It took me most of my adult life to understand why.
The reason nobody changed their mind is that the argument was never operating at the level where minds get changed. I was working at the surface. The real architecture was underneath, in a layer neither of us could see during the conversation, and no amount of logic applied to the surface was going to touch what lived beneath it.
That layer has a name. The theologians call it presuppositions. The philosophers call it first principles. In the framework of this book, I call them boot parameters. And understanding what they are, where they live, and who has the authority to change them is the difference between apologetics that clears the ground and apologetics that pretends it can plant the seed.
Every computer, when you turn it on, runs a set of instructions before you ever see the screen. The BIOS loads. The firmware initializes. The operating system boots. And by the time the user sees the desktop and starts clicking around, a thousand decisions have already been made underneath - which hardware to use, which drivers to load, which services to start. The user doesn’t choose any of it. The user isn’t even aware most of it happened. But everything the user does from that point forward is constrained by and dependent on those invisible decisions that were made before the screen lit up.
Your mind works the same way.
Before you ever reason about God, before you ever evaluate an argument, before you form your first conscious opinion about anything, a set of presuppositions has already loaded. These are the deepest assumptions your mind operates from - assumptions about what counts as evidence, what counts as logic, what counts as real, what counts as true. You didn’t choose them. You’re mostly not aware of them. But every thought you think, every argument you evaluate, every conclusion you reach is running on top of those presuppositions. They are the firmware underneath your reasoning. And your reasoning cannot inspect its own firmware any more than a program can rewrite the BIOS while it’s running on it.
This is not a metaphor I invented to make a theological point. This is how the mind actually works, and it maps perfectly to what Scripture has been saying for two thousand years.
“For as he thinketh in his heart, so is he.” (Proverbs 23:7)
The heart thinks before the head reasons. The presuppositions live in the heart - not the physical organ, but the seat of a person’s deepest commitments, the place beneath the conscious mind where the boot parameters are installed. And as a man thinketh in his heart, so is he. Not as he reasons. Not as he concludes. As he thinketh in his heart. The heart sets the parameters. The head runs the applications. And the applications can never override the parameters they’re running on.
Here is where this gets uncomfortable for the person who thinks they’re being reasonable and objective.
There is no neutral ground.
Every human being who has ever lived reasons from presuppositions, not toward them. The atheist does not arrive at materialism by following the evidence wherever it leads. The atheist starts with the presupposition that the material world is all there is, and then interprets every piece of evidence through that lens. The evidence doesn’t produce the conclusion. The presupposition filters the evidence so that the conclusion is the only one visible.
And the Christian does the same thing. The Christian starts with the presupposition that God exists, that He is sovereign, that He authored reality, and that His Word is true. And the Christian interprets every piece of evidence through that lens. The evidence is the same evidence. The world is the same world. The difference is in the firmware, not in the data.
This is the single most important insight in all of apologetics, and most Christians have never heard it. They’ve been told that Christianity is the conclusion of a neutral investigation. That if you just look at the evidence honestly, you’ll arrive at God. That the resurrection can be proved by historical argument. That the existence of God can be demonstrated by philosophical reasoning. And there’s a sense in which all of that is true - but not the sense most people mean it in.
The evidence is there. The arguments are valid. But they are valid within the Christian presuppositional framework. To the person operating from materialist boot parameters, the same evidence produces a different conclusion. The materialist looks at the resurrection and sees a legend that grew over time. The materialist looks at the fine-tuning of the universe and sees a multiverse. The materialist looks at consciousness and sees an emergent property of chemistry. The data didn’t change. The firmware changed.
And here is the devastating part: the materialist thinks he’s being neutral. He thinks his framework is the default. He thinks that materialism isn’t a presupposition at all - it’s just how things are. He calls his starting point “science” or “reason” or “evidence,” and he calls the Christian’s starting point “faith” - as if faith were the departure from neutrality and his position were the baseline.
But it’s not. Materialism is a presupposition. The belief that the physical world is all there is, that only empirically verifiable claims count as knowledge, that consciousness is reducible to chemistry - these are starting assumptions, not conclusions. They cannot be proved from within the materialist system without using the materialist system to validate itself. That’s circular reasoning. And the materialist is guilty of the same circularity he accuses the Christian of.
“The fool hath said in his heart, There is no God.” (Psalm 14:1)
In his heart. Not in his head. The denial of God is a heart commitment, a boot parameter, a presupposition installed at the firmware level. It’s not the conclusion of careful reasoning. It’s the starting point that makes the reasoning look careful.
So if both worldviews are circular - if the Christian presupposes God and reasons from that, and the materialist presupposes matter and reasons from that - then neither can be proved from outside its own system. And that sounds like a stalemate. That sounds like nobody can know anything. That sounds like we’re stuck in competing narratives with no way to adjudicate between them.
But that’s not what it means at all.
The question was never “which can be proved?” The question is: which presupposition accounts for more of reality?
And this is where the materialist’s system collapses.
The materialist has to account for consciousness. He can’t. If the brain is nothing more than chemistry - atoms and molecules following the laws of physics - then every thought you have is just a chemical reaction. Including the thought “materialism is true.” And if that thought is just a chemical reaction, then it wasn’t arrived at by reasoning. It was produced by chemistry. And chemistry doesn’t reason. Chemistry doesn’t arrive at truth. Chemistry just reacts. There is no mechanism in a materialist universe by which undirected chemical processes can produce reliable thoughts about the nature of reality. The materialist uses his mind to argue that the mind is nothing more than chemistry - and in doing so, he saws off the branch he’s sitting on.
The Christian presupposition accounts for consciousness. If reality is information in the mind of God, as Chapter 1 established, then consciousness is not emergent - it’s fundamental. Mind precedes matter. The ability to think, to reason, to grasp truth, is a gift from the Mind that authored reality. Reason works because it was designed to work. Logic is reliable because it was authored by a logical God. The intelligibility of the universe is not an accident - it’s a feature of a universe that was thought into existence.
The materialist has to account for morality. He can’t. If there is no God, then there is no objective standard of right and wrong. There are only chemical preferences. And you can call those preferences “morality” if you want, but they have no binding authority. They’re just feelings produced by neurons that don’t know they’re neurons. The materialist lives as though some things are genuinely right and genuinely wrong, but his system provides no foundation for that conviction. He borrowed it from the Christian framework and forgot where it came from.
The materialist has to account for the intelligibility of the universe. He can’t. Why does mathematics work? Why do the laws of physics hold from one moment to the next? Why is the universe comprehensible to the human mind at all? If the universe is the product of random, undirected processes, there is no reason to expect it to be orderly, predictable, or understandable. The materialist assumes order and then investigates it - but his system cannot explain why there is order to investigate.
The materialist has to account for information. He can’t. DNA is authored code. Functional, specified information does not arise from random processes. A programmer since age ten knows what authored information looks like. And the genetic code looks authored. Not because I need it to for my theology. Because it does.
The Christian presupposition accounts for all of this. Consciousness, reason, morality, order, information, beauty, love, the intelligibility of the universe - all of it is explained by a sovereign Mind that authored reality with purpose. The system is coherent. The system is complete. And the system predicts its own rejection.
This is where most people accuse presuppositionalism of being unfalsifiable. And I want to address that head-on, because it’s the sharpest version of the objection.
The accusation goes like this: “Your system says that anyone who disagrees with you is just operating from wrong presuppositions. So there’s no possible evidence that could disprove your system. It’s unfalsifiable. It’s not a real argument - it’s a tautology.”
And here is my answer.
“But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.” (1 Corinthians 2:14)
The natural man - the person operating from unregenerate boot parameters - does not receive the things of the Spirit. They are foolishness to him. Not just unpersuasive. Not just unlikely. Foolishness. And the reason is not that the evidence is bad. The reason is that the evidence is spiritually discerned, and the natural man does not have the spiritual capacity to discern it.
This is not an ad hoc defense. This is not something Christians made up after the fact to explain why people don’t believe. This was written two thousand years ago, before presuppositional apologetics had a name. Paul predicted exactly what happens when you present the gospel to a natural mind: the natural mind calls it foolishness. And the prediction has been confirmed in every generation since.
Now, is that unfalsifiable? In one sense, yes - from within the materialist system, you can’t falsify it, because the materialist system doesn’t have the categories to evaluate it. But that’s not a weakness. That’s the point. The materialist’s demand for falsifiability is itself a presupposition - the presupposition that only empirically testable claims count as knowledge. But that claim isn’t empirically testable. It’s a philosophical commitment. A boot parameter. And the materialist is using his own circular system to demand that the Christian’s system submit to his criteria - criteria the materialist’s own system can’t justify.
The system doesn’t claim to be falsifiable by materialist criteria. It claims to be self-authenticating by its own criteria. And so does materialism. The difference is that the Christian system accounts for why the materialist rejects it. The materialist system cannot account for why the Christian accepts it - except by calling the Christian irrational, which is itself a presupposition about what counts as rational.
And here is where everything connects back to the framework of this book.
If faith is a gift of the Spirit, as Galatians 5:22 says, and if regeneration precedes faith, as Chapter 16 established, then no argument can produce faith. Arguments operate at the application layer. They deal with evidence, logic, propositions, counterarguments - all surface-level operations. But faith is a firmware event. It happens beneath the application layer, in the boot parameters, where the Spirit operates and the conscious mind cannot reach.
“For it is God which worketh in you both to will and to do of his good pleasure.” (Philippians 2:13)
“To will” - that’s the firmware. The willing is changed before the doing. God works in the subconscious before the conscious mind acts. The Spirit flashes the firmware - installs new boot parameters, new presuppositions, a new heart orientation - and then the application layer starts producing different output. The believer doesn’t reason his way to God. The believer’s boot parameters get changed, and then the reasoning follows.
This means apologetics has a real but limited role. Apologetics cannot change anyone’s boot parameters. Only the Spirit can do that. But apologetics can do two things that matter.
First, apologetics can expose the other person’s presuppositions. Most people have never examined their own boot parameters. They think their assumptions are just “how things are.” The presuppositionalist can show them that their system is circular too, that their starting points are assumptions, not conclusions, and that their system can’t account for the very tools it uses to argue - reason, morality, consciousness, order. That exposure is valuable. It doesn’t save anyone. But it strips away the illusion of neutrality. It removes the comfortable fiction that the materialist is standing on solid ground while the Christian is standing on faith. Both are standing on faith. Only one admits it.
Second, apologetics can present the truth. The Spirit uses means. He uses the preaching of the gospel, the presentation of truth, the proclamation of Christ crucified and risen. The Spirit doesn’t operate in a vacuum. He works through the Word, through testimony, through argument. The apologist provides the material that the Spirit uses. We can’t flash the firmware. But we can provide the data that the Spirit loads when He does.
“So then faith cometh by hearing, and hearing by the word of God.” (Romans 10:17)
Faith comes by hearing. The hearing is the means. The Spirit is the cause. The apologist provides the hearing. The Spirit produces the faith. We clear the ground. He plants the seed.
I should tell you how I came to this position, because it wasn’t through reading Van Til or Bahnsen. I didn’t learn presuppositionalism from a textbook. I learned it from decades of arguing with people and watching every argument fail to change a single mind.
I came to it the same way I came to everything else in this book - through Scripture and lived experience. I watched intelligent people reject overwhelming evidence. I watched brilliant minds dismiss arguments they couldn’t answer. I watched people who were clearly losing the debate walk away more entrenched than before. And the pattern was so consistent, so universal, that I eventually had to ask: why? Why does evidence not work? Why does logic not work? Why can I win every point and change no one?
And Paul already had the answer. The natural man receiveth not. Not “has not yet been shown enough evidence.” Not “needs a better argument.” Receiveth not. The capacity is absent. The firmware doesn’t support the application. And no upgrade to the application layer is going to fix a firmware problem.
After I arrived at this position from Scripture and experience, I discovered that Cornelius Van Til and Greg Bahnsen had built an entire apologetic method on the same foundation. They called it presuppositionalism. They articulated it with far more philosophical rigor than I ever will. And I am grateful for their work, because it gave me vocabulary for what I already knew.
But I want to be clear: I didn’t arrive here because Van Til convinced me. I arrived here because 1 Corinthians 2:14 is true, and I watched it play out in every conversation for as long as I’ve been a believer.
If all reasoning is circular, then the honest person admits it. He doesn’t pretend his starting point is neutral. He doesn’t call his presuppositions “science” and the other person’s presuppositions “faith.” He names his boot parameters and takes responsibility for them.
If only the Spirit can change boot parameters, then humility is the only posture for the apologist. You are not the hero of the conversation. You are not going to save anyone with your clever arguments. You present truth. You expose false assumptions. You clear the ground. And you wait on the Lord. Because the Lord is the only one with root access, and root access is what this problem requires.
If the system predicts its own rejection, then the Christian is not surprised or threatened when people call the gospel foolishness. Paul told you they would. The rejection is not evidence against the system. The rejection is predicted by the system. And a system that accurately predicts the behavior of those who reject it is a system that accounts for reality better than the alternative.
And if the Christian presupposition accounts for consciousness, reason, morality, order, information, beauty, and the intelligibility of the universe - while the materialist presupposition cannot account for any of them without borrowing from the Christian framework - then the honest mind knows which boot parameters produce a coherent rendering of the world.
The honest mind. That’s the key phrase. Because honesty itself is a presupposition. The willingness to examine your own starting points, to admit your reasoning is circular, to hold your system accountable to the world it claims to describe - that willingness is not produced by argument. It’s produced by the Spirit. Which means the whole system loops back to the beginning, back to the sovereignty of God, back to the Author who writes both the questions and the answers, both the seekers and the scoffers, both the firmware and the flash.
“No man can come to me, except the Father which hath sent me draw him.” (John 6:44)
The drawing is the firmware flash. The coming is the application layer responding. And between the two, there is nothing you or I or the cleverest argument in the world can provide.
We clear the ground. The Spirit plants the seed. And every argument we’ve ever won was just the ground being cleared for something we couldn’t do ourselves.
“If all reasoning is circular, you can’t prove Christianity is true.”
Correct. No worldview can be proved from outside its own system. The materialist can’t prove materialism without using materialist assumptions. The rationalist can’t prove rationalism without using rationalist assumptions. The empiricist can’t prove empiricism without making an empirical claim. Every system validates itself by its own criteria. The question was never “which can be proved?” The question is “which presupposition accounts for more of reality?” The Christian presupposition accounts for consciousness, reason, morality, order, information, beauty, and the intelligibility of the universe. The materialist presupposition can’t explain why undirected chemistry produces reliable truth. One system is coherent. The other borrows from the one it rejects.
“Presuppositionalism is intellectual arrogance - you won’t even engage with evidence.”
We engage with all the evidence. Every scrap of it. We just interpret it through presuppositions - which is exactly what every other person on the planet does. The presuppositionalist is not the one who refuses to engage with evidence. The presuppositionalist is the one who is honest about the fact that evidence is always interpreted through a framework. The classical apologist who claims to follow “the evidence wherever it leads” is the one being dishonest - because the evidence doesn’t lead anywhere by itself. Evidence is inert. Interpretation does the leading. And interpretation runs on presuppositions.
“If only the Spirit can change boot parameters, apologetics is useless.”
Apologetics is not useless. Apologetics is limited. The Spirit uses means. He uses the preaching of the Word, the testimony of believers, the presentation of truth. The apologist provides the occasion that the Spirit uses to flash the firmware. We can’t produce faith. But we can present truth, and truth is what the Spirit works through. The farmer who plants the seed doesn’t make it grow. But the seed has to be planted. We clear the ground, we plant the seed, and God gives the increase. The farmer isn’t useless. He’s just not God.
“This makes Christianity unfalsifiable.”
Christianity is not falsifiable by materialist criteria. Neither is materialism falsifiable by Christian criteria. Both systems are internally self-validating. The charge of “unfalsifiable” is itself a presupposition - the assumption that only claims falsifiable by empirical testing count as knowledge. But that claim is not itself empirically testable. It’s a philosophical commitment. A boot parameter. The materialist is demanding that the Christian’s system submit to a criterion that the materialist’s own system can’t justify. The honest response is not to submit to a rigged standard. It’s to point out that the standard is rigged.
“You’re just saying ‘you have to believe to understand,’ which is circular.”
Yes. And the materialist is saying “you have to accept empiricism to evaluate claims,” which is also circular. Every epistemology is circular at the foundation. The question is whether the circle accounts for reality. Ours does. Theirs doesn’t. The difference is not in the circularity - it’s in the comprehensiveness.
Read A Thought in the Mind of God offline in your preferred format.
Commentary