There is a particular way of losing an argument that I did not have a name for until embarrassingly late. It is not the ordinary way, where someone reasons better than you and you come away having learned something. It is the other way: where you are right at every step and it changes nothing.
I was in one of these a few years ago. I will not tell you what it was about, because the moment I do, half of you will take a side and stop listening. So take only the shape of it. I had the facts. I had checked them, and they were good, and I set them out one after another, and each one was true, and each one, I thought, ended the conversation. The person across from me looked at every fact I produced, and agreed, and said yes — and did not change his position at all.
At some point, too late, I understood what was happening. He was not denying my facts. He agreed with them. The facts simply were not where the disagreement lived. I was treating the question as one you settle by establishing what is true — producing true things and waiting for the other person to give way. He was treating it as a different kind of question altogether. To him the true things I kept producing were beside the point — not false, just not the sort of thing that decides the matter. We were both entirely serious. We were both reasoning. We had simply never agreed, either of us, on what would even count as settling it.
That is a stranger place to be than being wrong. When you are wrong, there is a fact that corrects you, and the other person can show it to you. But we did not disagree about a fact. We disagreed about what a fact was for. We were two people applying two different standards for what would decide the question, each keeping careful count by a standard the other one did not use.
This is Philosophy for Us — philosophy for everyone, no degree required. This is the third of eight episodes — the last series this show will make — about the edge of argument: the point where you have reasoned all the way down and the other person is still on the far side.
Last time, I built the hope you walked in with into its strongest and most serious form. The philosopher was Jürgen Habermas, and its heart was a single phrase: the unforced force of the better argument. Take every pressure out of the room that is not the reasoning itself, and one thing still remains that can move a free person — the better argument. So if two people are still apart, perhaps the conversation was never free. I built that up in full, and I told you the truth: I have not refuted it, and I am not going to.
But the whole hope rests on three words, and tonight we test them until they hold or give way. The better argument. The hope works only if, when the better argument arrives, both people can tell that it is the better one. So here is the question for the hour: what does it take for a reason to strike two people as the better reason? And is that thing present, in the room, when you most need it? Because on the afternoon I described, I had the better argument — I am fairly sure I did — and it made no difference. He could not see it as better, and from where he sat, perhaps I was the one who could not. So before we ask whether more argument would close the distance, we have to ask what lies underneath it: better by whose standard — and what happens when there is no standard you share?
Let me pick the hope up exactly where we left it, because I want to bound it honestly, not overturn it.
Here is where we landed last time. The rationalist — Habermas at his strongest — says the better argument has a force of its own. Not the force of who is louder or who is in charge. A quieter force: when a reason is genuinely better, a free person feels its pull and moves. So when two people are still apart at the end, his question is not "did you try hard enough." It is "was the conversation ever free — or was something other than the reasoning shaping it?" And I said last time that this is a demanding test. Most of the lasting disagreements we run into took shape inside conversations that were never free.
I gave you that whole picture, and I meant it. Now I want to test the one place it might give way. And it is not where you would expect. It is not the word force, and not the word unforced. It is the smallest of the three words. Better.
Consider what happens when the better argument does its work. The pull only lands if a person can recognise the thing pulling. A reason moves you because you can see that it is the stronger one — it fits the facts better, or it is more consistent, or it explains more, or it survives a test the other one failed. Every one of those is a standard. And to be moved by the better argument, both people have to hold the same standard. Both have to count the same things as evidence. Both have to agree on what is even relevant to the question. Both have to want, roughly, the same kind of thing from an answer. Share all of that, and the better argument can move both of them, because "better" means the same thing in each of their hands. There is one shared standard, and the argument is just the two of them reading it.
Now remove the shared standard.
That is the afternoon I described. I set out facts. They were true. The other person agreed they were true — and did not move, because in his hands "the better argument" was measuring something else entirely. To me, the decisive thing was which position fits the evidence. To him, the decisive thing was something the evidence did not touch — what kind of person you become if you accept it, or what it would cost the people he was loyal to, or a line he would not cross whatever the facts said. We did not have one standard that we were reading differently. We had two different standards. And here is the part that matters: the unforced force of the better argument has nothing to work on there. It cannot move us, because for it to move us we would have to agree on what makes an argument better — and that agreement is exactly what we did not have. It was not lying underneath our disagreement, waiting to be uncovered. It was our disagreement.
So here is the bound, and I will state it carefully, because it is easy to overstate. This does not refute Habermas. Everything I built last time still stands. The free conversation is still a demanding test — most of the time, when we reach an impasse, the conversation really was not free, and a freer one really would have moved something, and we do not get to call a disagreement final until we have made the conversation genuinely free. All of that holds. I am not taking it back.
What I am adding is a limit. Habermas's whole account — the better argument moving free people toward agreement — runs on a shared standard of what "better" means. It assumes that standard is there. And it is right to assume it most of the time, because most of the time it is there: two people do agree on what the question is and what would count as answering it, and they are only in dispute about the answer. But in the hardest cases the first night described — two people who have reasoned all the way down and are genuinely, fully apart — what has run out is often the standard itself. Not the arguments. The agreement about what would make one argument beat another. And the unforced force of the better argument cannot reach down and supply that, because it needs that already in place before it can do anything at all.
You can see why this is the honest bound and not a cheap one. The rationalist could reply: very well, then let us argue about the standard. Let us make the standard itself the topic. And sometimes — genuinely — you can, and it works, and there was a deeper shared standard you had not yet reached. But notice what you are doing when you do that. You are hoping there is a further shared standard, underneath the one you found you did not share, that you can both read. And perhaps there is. But "there is always a deeper shared standard" is simply the rationalist's hope again, moved down one level — and it meets the same question one level down. At some point, if you are honest, you reach a place where there is no further standard to appeal to, because the standards are the very thing you disagree about, and it goes the whole way down. Habermas describes, and describes well, what reasoning does when there is a shared standard. He does not give you a standard when there is none. No one can. That is not a flaw in his theory. It is its limit.
So we have bounded the hope. Not broken it — bounded it. And now a fair question is sitting right there, the rigorous one, the one a careful person asks next. Two people, equally serious, equally informed, have found that they do not share the standard, or have argued the standard down as far as it goes and are still apart. That is the situation. So what is it reasonable to do, standing in it? Not as a feeling — as a question about what to believe. That question has a whole field of serious people working on it now, and they have answers. Let us go and get them.
For most of the last century, if you had reached the impasse I opened with and asked a philosopher what to do, you would have got something grand and a little vague — about reason, and its limits, and the human condition. In the last twenty years or so, a group of philosophers grew tired of the grandeur and made the question small and exact instead. Small and exact is a compliment. It is usually where the real work is.
Here is how they set it up, and notice how closely it matches the case. Set aside "the limits of reason." Picture two people who are what these philosophers call epistemic peers. That means only this: as far as either can tell, they are evenly matched on the question. Both have seen the same evidence. Both are about equally careful, equally intelligent, equally free of any obvious bias. Neither is the expert and neither the fool. And they have laid it all out for each other — every reason, every consideration, nothing held back. And at the end of it, one believes a thing and the peer believes its opposite. That is the whole scene, stated without a single grand word. And the only question on the table is the precise one: what is it now rational to believe? Not what to feel. Not what to do about the relationship. What should a person actually think is true, now that someone every bit as careful has looked at the same things and concluded the opposite?
There are three serious answers, and most of us have half-held all three at different times.
The first I will call the conciliatory answer — it also goes by the plainer name, the equal-weight view. It says: the peer's disagreement is itself a piece of evidence, and you have to count it. Consider what you actually know. You know that someone as careful as you, looking at exactly what you looked at, came down the other way. If you genuinely believe the two of you are equals on this — not that they are secretly less able, not secretly biased — then their conclusion is real evidence that you might be the one who went wrong. And you cannot simply set that aside without quietly deciding that you are the better reasoner after all, which is the one thing you said you were not. So the rational course, on this view, is to give their judgement the same weight you give your own and meet in the middle: lower your confidence, move toward them. Two equal witnesses pointing opposite ways; the honest reading is to become less sure. David Christensen and Adam Elga worked this out in detail, and it is hard to shake, because it runs on your own modesty. You called them your equal. The equal-weight view only asks you to mean it.
But there is a second answer that answers the first directly — the steadfast one. Its sharpest defender is the philosopher Thomas Kelly, and its slogan is the right reasons. It says: wait. You did not believe your view for no reason. You believed it because you looked at the evidence and the evidence genuinely supported it. The reasons were good. And the bare fact that someone else, however careful, did not see what you saw does not reach back into the evidence and make your reasons any weaker than they were. If you have the right reasons, you have them. Backing down merely because a peer disagreed treats the disagreement as if it could outweigh the evidence itself — and it cannot; a count of heads is not a reason. On this view a person can rationally hold their ground, not out of stubbornness, but because what should move a belief is the evidence, and the evidence did not change when the other person disagreed.
And then the third answer, which sounds like an evasion and is not — call it the permissive one. It says perhaps you are both fine. Perhaps two careful people can take the very same evidence and land in different places, and neither is making a mistake. The evidence, on this view, does not always force exactly one answer; sometimes it leaves a little room, and two reasonable people can occupy different parts of that room and both be reasoning correctly. Not "one of you must be wrong." Not "split the difference." Simply: the same evidence permitted two different honest verdicts, and that is allowed.
Now here is what to take from all this, and it is not a winner. I am not going to tell you which of the three is right, and I am not being coy — the people who do this for a living are genuinely divided, and the question is live and hard. Take instead what they have achieved. They took the foggy, grand statement — we have hit the limit of reason — and turned it into a sharp, answerable question: given that a peer disagrees, what should you believe? And they gave it real answers, each a serious position: count the disagreement and soften; trust your reasons and hold; or grant that you might both be in the clear. These are not evasions. Each is a precise, defensible account of what it is rational to believe when you and an equal are stuck. This is the best the field has, aimed straight at the case, and I am not going to touch it. It is correct, as far as it goes.
Hold on to five words for later: what it is rational to believe. Because every one of these three answers — soften, hold, or both-are-fine — is an answer to that question. And we will come back to whether that was the only question the afternoon was asking. Not yet. First there is one more answer, and it is the one that names our worst disagreements most exactly.
The peer-disagreement philosophers gave us the cleanest possible version of the case: two equals, the same evidence, opposite verdicts, and a precise question about what to believe. But there is one thing they mostly hold fixed to do their work, and that one thing is the whole of the afternoon I described. They tend to assume the two peers at least share a framework — that both agree on what the evidence is, and what is relevant, and what would count as settling it, and have only weighed it to different conclusions. Inside that assumption, "soften, hold, or both-are-fine" are exactly the right three answers.
But the afternoon I described was not inside that assumption. We did not share the framework. We disagreed about what the evidence even was — what was relevant, what a good answer would look like, what kind of thing could possibly settle it. And there is a philosopher who took that situation, specifically, and gave it a name and a diagnosis: Robert Fogelin. He called it a deep disagreement.
Here is the distinction, and it is sharp. Most disagreements are shallow — and I mean that as a technical term, not an insult. A shallow disagreement is a dispute about something inside a shared framework. We agree on the rules; we agree on what counts; we are only arguing about how it comes out. Two people disagree about whether it will rain tomorrow — but they agree completely on what would settle it, namely what the sky does tomorrow. That is shallow, and shallow disagreements are the ones argument is built for. More evidence, better reasoning, and the gap closes, exactly as the hopeful picture promised.
A deep disagreement is different in kind, not in size. In a deep disagreement, what the two people diverge on is the framework itself — the background commitments that decide what gets to count as a reason in the first place. What is evidence. What is relevant. What a resolution would even look like. And Fogelin's point — the hard, structural one — is that when those are what you disagree about, argument does not merely have a hard time. Argument cannot run at all in the ordinary way, because argument needs shared background to work. An argument takes things both people already accept and moves them from there to something new. But if what they disagree about is the things they would both have to already accept, there is no shared starting point to move from. The procedure has nothing to work on. It is not that the argument was long and they grew tired. It is that there was no shared starting point for the argument to use at all.
So set Fogelin next to the rationalist, because here they genuinely part company. Habermas would say: a deep disagreement is still, in principle, resolvable — make the conditions ideal enough, free enough, patient enough, and even the frameworks can be brought into the conversation and worked through. The deepest commitments are shared eventually, if only you can reach them. Fogelin's answer is bleaker: no. Some disagreements are deep the whole way down. There is no further shared commitment beneath the divergence — the divergence in the framework is the bottom, and argument, which works only on shared commitments, simply cannot cross it. Not "has not yet." Cannot. As a matter of structure.
And I want to be honest about one thing, because it would be easy to smuggle in a verdict here and I am not going to. Fogelin's view is contested too. Other philosophers push back — they say even framework disagreements can sometimes be argued, slowly and indirectly, by finding some point of common ground off to one side and working from there; that "deep" is not always "bottomless." That is a real dispute, and it is live, and I am not settling it tonight either. What I am handing you is that deep disagreement is a serious, standing possibility — perhaps the most exact name anyone has given our worst arguments. Sometimes the reason you could not resolve it is not that you were lazy, and not that the conversation was unfree, and not even that you should lower your confidence and meet in the middle. Sometimes it is that the disagreement was deep — the two of you starting from different commitments, with no shared one beneath them — and argument was never the tool that could reach across, because argument needs shared commitments and you did not have them. That may simply be the truth of it. Nothing more needs to be added.
Look at what we are holding now, at the end of three serious answers. The rationalist, bounded: the better argument moves people, but only where they share the standard of "better." The peer-disagreement philosophers: when you are stuck with an equal, soften, or hold, or grant that you might both be fine. And Fogelin: some splits are deep, and argument cannot, as a matter of structure, cross them. Every one of these is still standing. I have not refuted a single one. And every one is a real, rigorous, contemporary answer to the question the afternoon raised.
So you would think we were finished. You would think that was the whole survey — the best the field has, laid out, nothing chosen as winner, all of it live. And it is the whole survey of one question. Let me show you, in the last stretch, the thing all three of them quietly have in common — and the question standing just outside the edge of that survey, that none of them is built to ask.
Look at what you are holding, because it is far more than you came in with, and it is solid even though I have named no winner.
You walked in last time with the rationalist's hope at full strength — keep arguing, the better argument wins, the only thing missing is more reasoning. You leave with that hope bounded. Not refuted — bounded. The better argument has all the force I promised it, but only where you and the other person already share the standard of what makes an argument better. Where that shared standard runs out — and at the hardest edge it sometimes does — the better argument has nothing to work on. That is real, it is yours now, and it does not take the rationalist away from you. It only shows you where his account stops.
And you leave with the best the field has built beyond that point. When you are stuck with someone you genuinely respect, there are three serious answers, each with force: their disagreement is evidence you might be wrong, so soften and move toward them; or your reasons were good and a count of heads does not undo them, so hold; or you might honestly both be in the clear. And beneath those, the bleaker possibility — that the disagreement was simply deep, the two of you starting from different commitments with nothing shared beneath them, and argument was never the tool that could cross it. I have not refuted one of those tonight, and I will not. Every one is standing, and every one is sometimes the truth of an actual life. That is the full account. It is a good one. Most of the time, it is the whole of what you need.
Now here is the unfinished thing, and I am going to point to it and then leave it — opening it tonight would take a step this series has not yet earned.
Look back at everything we built: the bound, the three answers, the verdict on deep disagreement. Set them side by side and ask what they have in common underneath. Every single one is an answer to the same kind of question. What should I believe? Soften my confidence, or hold it. Can argument get us there? Sometimes, where we share the standard; never, where the split is deep. Every answer treats the person across the table as, in the end, a source of evidence — a careful witness whose disagreeing with you is data about what is true, to be weighed and counted and reasoned from. And perhaps, within the argument, that is exactly what they are.
But you have sat across from one of these. At the end of the real one, with the person you could not dismiss. And whatever else was true in that silence, they were not only a source of evidence. They were a person, still there, still unconvinced, still looking back at you from the other side. And I have handed you tonight a dozen careful words for what you should believe in that moment — and not one word for what that person is to you, sitting there, unreached. Notice that. Every answer we built was an answer about the thing you were disagreeing over. Not one of them was about the person you were disagreeing with. There may be a question hidden in that silence that is not "what should I believe" at all — a question none of tonight's answers was built to ask, because they were all looking at the claim between the two of you and none of them was looking at the person.
I am not going to tell you what that question is. I am naming it without answering it — the answer comes later, and it has to be earned. But it is there. We spent the whole hour on the best answers anyone has to what to believe at the edge, and left untouched the possibility that believing may not be the only thing the edge asks of you.
This is the third of eight, and, if you have been with the show, the third of its last. We have now bounded the hope you walked in with, and laid out what is rational on the other side of that bound. Next time the difficulty deepens, and an old opponent returns. Because if argument really does have a limit — if some distances are deep and the better argument cannot always cross them — then someone is waiting to tell you what that means: that past the limit of reason there is nothing left but preference and power, and all the careful talk was only noise over a contest of wills. This show set itself against that idea years ago. Next time that idea makes its strongest case, precisely because the limit we found tonight looks as though it proves the idea right. I am going to take it seriously, and then I am going to refuse it — and you will have to hold the hardest position yet, still without a name for the third thing.
But before then, an exercise, and it is a new one. Take the disagreement you have been carrying — the real one, the person you cannot write off. Last time I had you ask whether the conversation was ever free. Tonight, ask a different question of it. Did the two of you ever share a standard for what would settle it? Was there any fact, any consideration, anything at all, that both of you would have accepted as deciding the matter? Go looking, honestly. Perhaps there was — you agreed on what the question was and what would answer it, and were only stuck on the answer. If so, the disagreement can still be worked through; keep going. But perhaps, when you look, you find what I found that afternoon: that you kept setting out what was decisive to you and watching it fail to land for them, because the two of you never shared what "decisive" meant. If that is what you find, you have found the bound with your own hands. Not bad faith. Not laziness. Two people, two standards, and the better argument with nothing to work on.
Find out which one it was. And then do not rush past what is left over. Even once you have named it — shared standard or no shared standard, soften or hold, deep or shallow — there is still a person on the other side, and you still do not have a word for what they are to you there. Neither do I, tonight. Do not rush to fill it. That is the exercise. We will go looking for the word soon.
Thanks for listening. I'll see you next time.