How Do We Defend Biblical Authority in a Post-Truth Culture?

Question 1131.

Biblical authority sounds like an old-fashioned phrase to defend in a culture that has largely stopped agreeing there is such a thing as truth to be authoritative about. “Post-truth” was named the Oxford English Dictionary word of the year back in 2016, describing a climate where appeals to emotion and personal conviction carry more weight in public argument than appeals to fact. Nothing has improved since. So when I stand up and claim biblical authority for the Scriptures, I am not simply making one more competing claim in a market of equally weighted opinions. I am claiming something that the prevailing culture has already decided, in advance, cannot exist.

I want to work through what biblical authority actually means, why a post-truth culture finds it so difficult to hear, and how I go about defending biblical authority to people who have been trained, often without realising it, to treat all truth claims as disguised power plays.

What biblical authority actually claims

Biblical authority means that Scripture, as the God-breathed word of the living God, carries binding claim over what I believe and how I live, not because I find it persuasive or emotionally satisfying, but because of who gave it. Paul tells Timothy that “all Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness” (2 Timothy 3:16). That single verse is doing enormous work: it grounds biblical authority not in the Bible’s usefulness, though it is useful, and not in its literary quality, though it has that too, but in its origin. Scripture speaks with God’s own authority because God himself is its ultimate author, even though he used human writers, their vocabularies, their personalities and their historical circumstances to produce it.

That is a very different claim from saying the Bible is one more ancient text worth consulting alongside others for wisdom. Biblical authority is a claim of a different order altogether: this book has the right to correct me, not just the potential to interest me.

Understanding the post-truth landscape

Before defending biblical authority, it helps to understand exactly what we are up against. Post-truth culture is not simply widespread lying, which has always existed. It is something more corrosive: a working assumption that objective, knowable truth either does not exist or cannot be reached, so that the only honest move left is to choose the narrative that serves your interests or feels most authentic to your experience. Combine that assumption with algorithm-driven media that rewards outrage over accuracy, and you get a culture that has lost not just this or that fact but the very category of fact as something that exists independently of how we feel about it.

Into that environment, a claim of biblical authority sounds, to the post-truth ear, like one more attempt to seize power by dressing up a preference as a command. That is a serious misunderstanding of what Scripture is, but it is an understandable one given the cultural water we are all swimming in, Christians included. I have caught myself, more than once, subtly treating my own opinions with more confidence than the text warrants and Scripture with less confidence than it deserves, simply because that is the ambient pressure of the age.

Why biblical authority does not depend on winning the argument

Here is where I want to be careful. Biblical authority is not established by successfully persuading a sceptical culture. It does not stand or fall on apologetic technique, however important good apologetics remains. Scripture carries its authority intrinsically, by virtue of its divine origin, whether or not any particular generation chooses to acknowledge it. That is actually good news for defending biblical authority in a post-truth culture, because it means I am not required to win the epistemological argument about the nature of truth itself before I am allowed to proclaim what Scripture says. I proclaim it, trusting that the Spirit who inspired it also opens hearts to receive it (1 Corinthians 2:14).

That said, I do think there is real apologetic work to do, not to manufacture something that needs no manufacturing, but to remove obstacles that keep people from seeing what is already true. Presenting the manuscript evidence, the historical reliability of the text, and the coherence of Scripture’s claims all serve that clearing-the-ground function. You can explore the manuscript evidence yourself through resources like the NET Bible’s extensive textual notes, which document just how well-attested the biblical text actually is compared with any other document from the ancient world.

Fact, narrative, and the category post-truth culture has lost

One of the more useful moves I have found in conversation is simply naming the category post-truth culture has quietly abandoned: the idea that some things are true regardless of who believes them or how anyone feels about them. Genesis 1:1 is either an accurate statement about who made the universe or it is not. It is not one narrative among equally valid narratives. Biblical authority depends on Scripture actually being what it claims to be, a real communication from the real God about real events and real obligations, not a helpful myth that works for those who find it works for them.

This is where I gently push back on well-meaning Christians who try to defend the Bible purely on the grounds that it produces good outcomes in people’s lives. That is true, and I am glad to point to it, but it is not why biblical authority holds. Biblical authority holds because God spoke, whether or not the results happen to feel good to a given hearer on a given day. Pragmatic defences alone hand the post-truth culture exactly the framework it already uses, judging truth by its usefulness rather than its correspondence to reality, and that framework is precisely what needs to be challenged, not conceded.

Practical ways I defend biblical authority

When I sit across from someone shaped by post-truth assumptions, I rarely start by asserting biblical authority as a bare claim, because that simply confirms their suspicion that I am asking them to accept my power move over theirs. I start further back. I ask what they actually think truth is, and let them notice, often for the first time, that they already live as though some things are simply true regardless of preference: that cruelty is wrong, that their own testimony deserves to be believed, that two contradictory claims cannot both be fully correct. Once that admission is on the table, the ground has shifted, because they have conceded the category of truth exists after all, and biblical authority can then be assessed on its actual merits rather than dismissed before the conversation begins.

From there I move to the historical case: the reliability of the New Testament documents, the external corroboration of biblical events, the fulfilled prophecy that no human author, left to himself, could have engineered. None of that manufactures the case from nothing. It simply removes the excuse for dismissing it without examination. You can look at primary evidence for yourself; the ESV.org study resources at ESV.org are a good starting point for reading the text itself alongside solid study notes, and I would rather someone wrestle honestly with the text than take my word for any of this.

Truth, aletheia, and the “your truth” objection

A very common post-truth move is the language of “your truth” and “my truth,” as though truth were a personal possession rather than a shared reality both of us are equally answerable to. It is worth pausing on the Greek word Scripture actually uses for truth, aletheia, which carries the sense of unconcealment, reality laid bare rather than a private impression. When Jesus tells Pilate he has come to bear witness to the truth (John 18:37), he is not offering Pilate one option among several equally valid truths. He is claiming to disclose reality as it actually stands, which Pilate then famously deflects with his own post-truth question, “What is truth?” Biblical authority answers Pilate’s question rather than shrugging at it, and I find that contrast worth pointing out directly in conversation, because it shows the “your truth, my truth” move is not a modern discovery. It is a very old evasion, and Scripture has already met it.

Naming this explicitly tends to do more work than any amount of raw evidence, because it invites the other person to notice they do not actually live as consistent relativists. Nobody wants their doctor, their bank, or their spouse operating on “my truth” rather than the truth. Biblical authority simply asks that the same standard applied everywhere else in life be applied to the claims of Scripture as well, rather than exempted at the one point where it becomes inconvenient.

The historical case, briefly stated

I do think the historical case for biblical authority deserves more than a passing mention, because post-truth culture tends to assume, without checking, that the biblical documents are late, heavily edited, and unreliable. The manuscript evidence says otherwise. We possess thousands of Greek New Testament manuscripts, some dating within a lifetime or two of the original composition, an evidential base that dwarfs anything else surviving from the ancient world by a wide margin. The Old Testament fares just as well: the Dead Sea Scrolls, discovered in the twentieth century, confirmed that the Hebrew text had been transmitted with remarkable care across a thousand years. None of that proves biblical authority in the theological sense, since a text can be accurately transmitted and still be false. I say this deliberately, because I would rather concede that limitation honestly than overstate what manuscript evidence alone can deliver. Reliability of transmission is a necessary support for confidence in the text, not a substitute for the deeper claim that this text is actually God’s own address to us. But it does remove the lazy objection that we cannot know what the biblical authors actually wrote, which is very often where the post-truth conversation quietly wants to end before it has properly begun.

Fulfilled prophecy adds a further layer that pure textual reliability cannot supply on its own. Micah names Bethlehem centuries before Jesus was born there (Micah 5:2). Isaiah describes a suffering, substitutionary death for a figure identified as God’s servant, in language that reads uncannily like an eyewitness account of Calvary, seven hundred years before Calvary happened (Isaiah 53). These are not vague generalities capable of being retrofitted to any outcome. They are specific enough that a serious reader has to reckon with them, and biblical authority gains real, testable weight from the fact that its predictive claims keep landing accurately.

The Spirit’s work beneath the argument

I want to be honest that no argument, however well constructed, produces faith in biblical authority on its own. Jesus told Nicodemus that the wind blows where it wishes (John 3:8), and the new birth that opens a person’s eyes to receive Scripture as what it is remains the Spirit’s own gift to give, not the product of my rhetorical skill. That keeps me humble in these conversations. I am not trying to win a debate. I am trying to be faithful with the evidence and the text while trusting God to do what only God can do in a person’s heart.

This does not mean argument is wasted effort. Paul reasoned in the synagogues (Acts 17:2), and Peter tells us to always be ready to give a defence for the hope within us (1 Peter 3:15). Defending biblical authority with careful, honest argument is simply obedience, even while the actual persuading remains God’s business rather than mine.

A conversation I keep having

Let me give you a composite of a conversation I have had more than once, because it illustrates how this actually plays out rather than how it looks on paper. A young man in his twenties, sharp, well read, thoroughly formed by university seminar rooms, tells me he respects that the Bible works for me personally but cannot accept that it holds any claim on him, since truth, as he puts it, is constructed rather than discovered. I do not begin by quoting 2 Timothy 3:16 at him, however true it is, because that verse only carries weight once someone already grants that God speaks and that his speech binds. Instead I ask him whether he thought it was simply a constructed preference, rather than an actual moral fact, that the professor who plagiarised a colleague’s research last year deserved to be exposed. He says no, obviously that was genuinely wrong. I ask him why an act of dishonesty is genuinely wrong if truth is only ever constructed by whoever is doing the judging. He does not have a tidy answer, and to his credit he does not pretend to.

That is usually where real ground gets covered, not in the moment I win a point, but in the moment someone notices the gap between the relativism they profess and the moral realism they actually live by. From there, I can talk honestly about biblical authority as the only coherent explanation for why some things really are true and really do bind us regardless of preference: because a real God, who is himself the truth, has spoken, and his speech reaches every person whether they have constructed a framework to receive it or not. I do not know whether that particular conversation ever bore fruit. I was not owed a convert for my trouble. I was simply asked to be faithful with the evidence and the question, and to leave the rest, as always, to the Lord who does the actual work of opening eyes. What strikes me, looking back over years of these conversations, is how rarely the decisive moment comes from a clever argument I happened to construct. It nearly always comes from someone quietly noticing that they already believe far more than their stated philosophy allows them to believe, and having nowhere else to put that discovery except into a framework that can actually account for it. That framework has a name, and it is not relativism. Its name is a real, speaking, self-revealing God, and its textual expression is the Scripture that carries his authority into every generation that has ever tried to talk it away, this one included.

So, now what?

If you find yourself intimidated by a culture that treats every truth claim as a disguised power grab, remember that biblical authority was never dependent on cultural approval to begin with. Do the careful work. Learn the historical and textual case. Ask good questions that expose the truth categories people already secretly rely on. And then trust the Spirit to do in someone’s heart what no argument of yours could ever accomplish alone. Biblical authority has outlasted every culture that has tried to talk it out of existence, and it will outlast this one too.

“All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness.”

2 Timothy 3:16, ESV

For Further Study

Charles Ryrie’s work on bibliology remains a clear entry point for the doctrine of Scripture’s authority and inspiration. Norman Geisler and the broader inerrancy tradition Ryrie stood alongside address post-truth style objections directly. J. Dwight Pentecost and John Walvoord, though best known for eschatology, both wrote extensively defending the reliability of the text their prophetic system depended on. Lewis Sperry Chafer’s Systematic Theology grounds biblical authority in the doctrine of God himself, and Millard Erickson provides a careful, evangelical treatment of how revelation, inspiration, and authority relate to one another. Arnold Fruchtenbaum’s writing, from a Messianic Jewish perspective, is particularly useful for showing how biblical authority holds together across both testaments without artificial division.