There is an old apologetic image, sharp enough that once you see it you cannot unsee it. A small child sits on her father's lap, and from that secure perch she draws back her hand and slaps him across the face. The picture is meant to capture the exact posture of unbelief. The defiance is real; the slap connects. But the whole act is only possible because the father is holding her up. She has the reach to strike him only because he supports her. Take away the lap and there is no slap — only a fall. This is what the older theologians meant by saying the unbeliever lives on borrowed capital: that every weapon he raises against God was forged in God's smithy, with God's iron, in the warmth of God's fire. He cannot strike at heaven except from heaven's own arms.
This article is the worked proof of that claim. The transcendental argument showed in the abstract that reasoning presupposes God; here we open the account books and trace three specific withdrawals the unbeliever makes every single day — three fortunes he spends freely while denying he has a cent. Watch each one, and watch the same pattern emerge: the thing is real, the thing is used, and the thing cannot exist on the unbeliever's own terms. He is not poor. He is rich on stolen credit, and the lender is the God he is trying to disprove.
Account One: The Laws of Logic
Begin where every argument begins, including every argument against God. The skeptic reasons — and reasoning runs on laws he did not invent and cannot suspend. A statement cannot be both true and false in the same way at the same time. A valid argument preserves truth from premises to conclusion. These laws have three features worth naming slowly, because each one is a problem for materialism. They are immaterial: the law of non-contradiction has no weight, no location, no charge; you will not trip over it or detect it on an instrument. They are universal: they hold in Beijing and in the Andromeda galaxy, in the lab and in the dream. They are unchanging: they did not evolve in the Pleistocene and will not be repealed next century. Now press the question that ended the Bahnsen–Stein debate and has never been comfortably answered: in a universe that is nothing but matter, energy, time, and chance — all of it physical, local, and in constant flux — where do immaterial, universal, unchanging laws come from? They do not come from matter, because matter is not any of those things. The honest materialist must admit the laws are simply there, helping himself to them as a man helps himself to a tool he never made. The Christian is not embarrassed for an instant: the laws of logic are a reflection of the consistent, truthful mind of God, and the world is rational because it was spoken into being by the Logos. The skeptic uses God's logic to argue God away. The branch holds; the saw is borrowed.
Account Two: The Uniformity of Nature
Now to the account that funds all of science, and the one most people have never noticed they are overdrawn on. Every experiment, every prediction, every act of trust that tomorrow's world will behave like today's, rests on a single unprovable assumption: that nature is uniform — that the future will resemble the past, that the laws operating here also operate there. Without it, science is impossible; with it, the modern world. And here the atheist's own patron saint walks in to collect the debt. David Hume, no friend of Christianity, demonstrated that the uniformity of nature cannot be proven. You cannot prove it by logic, because there is no contradiction in imagining a universe that suddenly behaves differently tomorrow. And you cannot prove it by experience, because all your past experience tells you only about the past; to leap from "it has always held" to "it will always hold" is to assume the very uniformity you are trying to prove. Bertrand Russell put it in feathers: the farmyard chicken, fed by the same hand every morning for a thousand mornings, forms a confident theory of the benevolence of the farmer — right up until the morning the farmer wrings its neck. Induction has no built-in guarantee. The materialist's universe gives him no reason whatsoever to expect order to hold, and yet he stakes his every breath on it.
The Christian, once more, has the resource the skeptic lacks. We expect the universe to be orderly tomorrow because it is upheld by a faithful God who does not change and who has told us so: "As long as the earth endures, seedtime and harvest, cold and heat, summer and winter, day and night will never cease" (Genesis 8:22). The regularity science depends on is not a brute cosmic coincidence we are lucky has lasted; it is the trustworthiness of the One who "sustains all things by his powerful word" (Hebrews 1:3). And this is where Colossians lands its weight. Of the Son, Paul writes: "He is before all things, and in him all things hold together" (Colossians 1:17). The phrase "hold together" is the Greek synestēken — and the tense is doing theology the English cannot quite carry. It is a perfect, which in Greek names a past action whose effect stands into the present and on: the cosmos has been gathered into coherence and goes on cohering, held this instant, as you read, in a unity sustained by Christ. Strip the verb to its picture and it means the universe does not merely happen to hang together; it is being held, continuously, by a Person. The uniformity Hume could not justify and the scientist cannot do without is the steady hand of the Son on the world. The skeptic does his experiments inside a coherence Christ supplies, and writes up the results as evidence against Him.
Account Three: Right and Wrong
The third withdrawal is the loudest, because it usually comes as an accusation. The atheist points at the Crusades, at slavery, at a child dying of cancer, and says: how dare your God — or there is no good God, look at this evil. The outrage is often sincere and sometimes more morally alive than the believer's. But notice what the outrage requires. To call something truly evil — not merely unfashionable, not merely something his tribe dislikes, but actually, bindingly wrong — he must appeal to a real standard of good that stands over all people, including the ones who disagree. And that is precisely what his worldview forbids him. The consistent atheist tells us the universe is, in Richard Dawkins's words, a place of "blind, pitiless indifference," with "no evil and no good, nothing but blind, pitiless indifference" at bottom. Very well — but then a child's suffering is not evil; it is only an event some evolved primates find distressing, the way other primates find the smell of a predator distressing. Evolution can explain why we feel moral; it can never deliver a single binding ought, because it describes only what creatures do, never what they should do. As Lewis saw, you cannot call a line crooked unless you have some idea of a straight line. The atheist's moral outrage is a straight line he keeps producing from a worldview that says there are only crooked ones — and there are only crooked ones because someone is grinding the wood. The standard he condemns by is the standard only the holy God can ground. He borrows God's ruler to measure God and finds Him wanting.
The Steel Man — "Even If I Can't Account for It, It Still Works"
Let the best version of the rebuttal speak, because thoughtful skeptics have several moves here and they deserve full strength. "This is a shell game. First, logic is just the way language and thought work — it doesn't need a cosmic grounding any more than the rules of chess need a divine chess-player. Second, induction is justified pragmatically: it has worked spectacularly well, so we keep using it, and we don't need a metaphysical guarantee. Third, morality evolved as a survival strategy for social animals, and that is a perfectly good account of why we have it. And finally, your whole argument is a genetic fallacy — you're saying that because I can't explain where logic came from, I'm not allowed to use it. But where something comes from has no bearing on whether it works. Logic works. Science works. Morality functions. Your accounting question is interesting and irrelevant." Each of those is a serious move. Each of them, pressed, only deepens the debt.
On "logic is just how thought works." That relabels the problem; it does not solve it. If the laws of logic are merely descriptions of how human brains happen to fire, then they are not universal and binding truths but local biological habits — which means they might differ for a differently evolved mind, and might have been otherwise, and carry no authority over anyone who reasons differently. But no one actually believes that. Everyone treats contradiction as genuinely impossible everywhere, not just unpopular in human skulls. The moment the skeptic insists his atheism is true and contradiction really cannot hold, he has left "how brains work" behind and reached for exactly the immaterial, universal, binding law his worldview cannot house. The chess analogy fails for the same reason: chess rules are arbitrary human conventions you can change by vote; the law of non-contradiction is not up for a vote, and the skeptic knows it.
On "induction is justified pragmatically." This is the most quietly circular sentence in modern thought. Why trust that what has worked will go on working? Because it has worked before. But "what has worked before will keep working" is the principle of induction itself — so the pragmatic defense of induction is induction vouching for induction, the witness swearing to his own honesty. Pragmatism does not escape Hume's problem; it is Hume's problem wearing a lab coat. The Christian alone can say why the past is a reliable guide to the future without arguing in a circle: because a faithful God upholds a stable world and has promised it will hold. Take Him away and the scientist is the chicken, confident in the farmer right up to the last morning.
On evolutionary morality and the genetic-fallacy charge. These collapse together, so answer them together. Yes, evolution may explain why we have moral feelings. But an explanation of why we feel that cruelty is wrong is not the same as a reason that cruelty is wrong — the first is a fact about us, the second a fact about cruelty, and no amount of the former adds up to the latter. You cannot squeeze an ought out of an is; you cannot get "you must not" out of "your ancestors who didn't tend to leave fewer offspring." And the genetic-fallacy charge misses the target, because the argument is not "logic is false because of where it came from." The argument is transcendental, not genetic: it grants that logic works and asks which worldview can account for its working — and then shows that the atheist's cannot, while the Christian's can. Pointing out that a man's account is bankrupt is not committing a fallacy about the origin of his money. It is auditing his books. And the books do not balance.
The Knowledge He Cannot Shake
Step back and ask the deeper question: why does the unbeliever go on so confidently spending capital his philosophy denies he has? Scripture answers without hesitation, and it is not flattering. He does it because, underneath the denial, he knows. "What may be known about God is plain to them, because God has made it plain to them. For since the creation of the world God's invisible qualities... have been clearly seen, being understood from what has been made, so that people are without excuse" (Romans 1:19-20). The atheist is not a man who genuinely cannot find the order, the logic, the moral law; he is a man who lives in them, leans on them every hour, and "suppress[es] the truth by their wickedness" (Romans 1:18). The borrowing is not an honest mistake of accounting. It is the behavior of a man who knows whose house he lives in and has decided to act as though he owns it. The autonomy he prizes is a performance staged inside a world he cannot stop depending on, addressed to a Landlord he cannot stop knowing.
The Capital Was Always Grace
And here the audit turns to mercy, because there is a tenderness hidden in the whole arrangement that the cornered skeptic never expects. Consider what it means that God lets the unbeliever keep borrowing. He could call the loan. He could withdraw the coherence for a single second and let the man's reasoning, his science, his very moral sense fall into the void they logically deserve on his own terms. He does not. He goes on holding the world together for the man who denies Him, goes on feeding the mind that argues against Him, goes on lending logic to the lips that curse Him. The theologians called this common grace, and it is everywhere on the unbeliever's books: every clear thought, every successful experiment, every flash of true moral outrage is a kindness from the God he is striking at, an undeserved daily allowance to a rebel. The slap lands; the lap still holds. The same hand that exposes the debt is the hand that has been paying it.
So the argument that begins by cornering ends by opening a door, and it is the door the whole site keeps pointing to. You have been spending His capital your whole life — His logic, His ordered world, His moral law written on your heart. The question presuppositional apologetics finally asks is not "will you admit the debt?" but "will you stop borrowing and come home to the Owner?" Because He is not a banker waiting to foreclose. He is a Father who has watched you spend His gifts against Him, and who sent His Son not to collect the debt but to pay it — to take, on a cross, the full account of every rebellion you financed with His own gifts. The capital you have been living on was grace all along. He is offering now to make you not a debtor on stolen credit but a child with an inheritance: everything, freely, His own. You can keep slapping the face that holds you up. Or you can turn around on the lap you never left, and find it was your Father's all along.
So we confess it, who spent His coin against Him for years and called it our own wealth: that every true thought we ever thought was His gift, that the world held together by His Son while we denied the Son, that the conscience we silenced was His law and the reason we trusted was His light. We took it all for granted and took the credit besides. To the Father who fed His rebels, to the Son in whom all things hold together, to the Spirit who finally made us see whose house we had been living in — be the glory, the riches, and the praise forever. Amen.
The lap holds her the whole time she is slapping. The capital was always grace.