If God is perfect… why does suffering exist? Richard Feynman explains the logical contradiction

Added: 2026-06-01

[00:00:00]There was a boy in my neighborhood in Far Rockaway.

[00:00:03]His name was David. We were maybe 10 years old, both of us.

[00:00:08]His mother got sick, real sick. The kind of sick that doesn't reverse itself, and one afternoon I watched him come home from synagogue, sit down on the front step, and stare at his hands for a long time.

[00:00:20]Just his hands.

[00:00:22]I went over and asked him what the rabbi had said. He said the rabbi told him God had a plan.

[00:00:27]That his mother's suffering was part of something larger.

[00:00:30]That God was perfect and good and knew what he was doing.

[00:00:34]And David looked up at me with this expression I have never forgotten in 60 years of living not angry, not sad exactly, just confused. The way you look when the answer you were given doesn't fit the shape of the question you asked.

[00:00:45]He said, "If God is perfect, why does it hurt so much?" I didn't have an answer.

[00:00:51]I was 10.

[00:00:52]But I filed that question away somewhere, the way my father taught me to file things not to dismiss, but to return to when I knew enough to actually look.

[00:01:01]I have spent 60 years learning enough to actually look. And what I found when I finally looked carefully, really carefully, the way you look at a physics problem that keeps giving you the wrong answer, is that David's question is not a question that has been poorly answered.

[00:01:16]It is a question that exposes something broken at the foundation of the concept being asked about.

[00:01:22]And I want to show you exactly what that is. Here is what I am going to tell you today, and I want you to hear it precisely, the simultaneous existence of a perfect, omnipotent, omniscient, and benevolent God, and the existence of suffering in the world is not a theological puzzle waiting for a clever solution.

[00:01:41]It is mathematically and logically in the same category as a triangle with four sides.

[00:01:49]Not difficult.

[00:01:51]Not mysterious.

[00:01:53]Incoherent. The contradiction is not softened by faith or resolved by tradition.

[00:01:58]It is structural.

[00:02:00]It lives in the definitions themselves.

[00:02:03]And I am going to show you, step by step, with no sleight of hand, using nothing but the same tools I applied to quantum electrodynamics and the Challenger disaster, careful logic, and an honest refusal to accept an answer that does not actually answer exactly where the architecture collapses and why no amount of theological engineering has ever fixed it.

[00:02:24]Because the problem is not in the walls.

[00:02:26]It is in the foundation.

[00:02:28]Now, before I do that, I want to stop for a moment and say something I mean completely.

[00:02:33]I am not doing this to hurt anyone.

[00:02:35]I know what this question costs. The people who built their courage around the idea that suffering has a purpose, that the loss of a child, the slow death of someone you love, the apparently random cruelty that the universe distributes without warning or justice, that all of it is somehow held inside a plan, those people are not stupid.

[00:02:53]They are not weak. They are doing what human beings have always done, which is try to find a way to survive the unbearable.

[00:03:00]My own father never pushed me toward religion or away from it.

[00:03:04]He only pushed me toward honesty.

[00:03:07]And some of the people I have loved most in my life found real comfort in the idea of a God who knew what he was doing even when they didn't.

[00:03:14]I respected that completely.

[00:03:16]I still do. But there is a form of respect that consists of treating someone's beliefs carefully and seriously enough to actually examine them.

[00:03:24]And that is the only form of respect I know how to give.

[00:03:28]So, what I am about to do is not demolition. It is examination.

[00:03:32]And the examination is honest about what it finds.

[00:03:35]I am going to walk you through four problems, four specific, precise, logical problems with the claim that a perfect God and a suffering world can coexist.

[00:03:45]Not vague philosophical objections.

[00:03:48]Not the complaint of someone who is angry at God.

[00:03:52]Four structural flaws, the kind that when a bridge has them, you do not fix the bridge with better paint.

[00:03:59]You have to go back to the drawings. The first problem is the one philosophers call the logical problem of evil.

[00:04:05]And it is the one I find most devastatingly clean, the argument that the three defining properties of God, taken together, produce a mathematical impossibility in the presence of any suffering at all. The second is the free will defense, which is the most common theological escape route, and which I want to follow carefully down to where it actually goes, because it goes somewhere uncomfortable that most people who use it have not noticed.

[00:04:29]The third is the one I tried hardest to find an error in. It is the problem of natural evil suffering that has nothing to do with human choice, and it is the one I find most honest to sit with, because it is the one that the theology has, in my view, never seriously addressed.

[00:04:45]And the fourth is the one that goes deepest. It is the problem of divine hiddenness in the context of suffering, and it connects back to something my father told me when I was 12 years old that I want to return to at the end.

[00:04:58]Let's go.

[00:05:00]The first problem is sometimes called the logical problem of evil, and I want to state it the way I would state a physics equation precisely, so that you can check every step.

[00:05:10]The theological claim is this. God is omnipotent, meaning capable of any action without limit.

[00:05:17]God is omniscient, meaning God knows everything that it is, was, and will be, including every instance of suffering before it occurs.

[00:05:25]And God is omnibenevolent, meaning God wants, with perfect and unlimited goodness, the best possible outcome for every being.

[00:05:35]Now, here is the logical structure. If God is omnipotent, God can prevent any instance of suffering.

[00:05:42]If God is omniscient, God knows about every instance of suffering before it occurs. If God is omnibenevolent, God wants to prevent suffering.

[00:05:52]A being with the power to prevent suffering, the knowledge to know it is coming, and the will to stop it, does not allow it to occur.

[00:06:01]And yet, suffering occurs.

[00:06:04]In the last hour, somewhere on this planet, a child died of a disease that could have been interrupted at any point in its causal chain by a being of unlimited power. That is not a rhetorical statement. It is an observable fact.

[00:06:18]The logical structure is airtight.

[00:06:20]The premises produce the conclusion that such suffering cannot occur in a universe governed by that God.

[00:06:26]The suffering does occur.

[00:06:28]Therefore, at least one of those premises must be false.

[00:06:32]God is either not fully powerful, or not fully knowing, or not fully good.

[00:06:37]Or God does not exist in the form described. I want to be honest here.

[00:06:42]I tried to find the error in this argument for a long time.

[00:06:46]I genuinely did.

[00:06:48]The argument has been around in its formal structure since Epicurus, around 300 BCE.

[00:06:54]20 Three centuries of serious theological thought have been applied to it. That is not nothing. And what I found after examining the major responses, every serious one, is that none of them actually solve the logical structure.

[00:07:07]They each either redefine one of the three properties until it means something different from what the theology requires, or they introduce a new concept, divine mystery, higher purposes that functions as an assertion rather than an explanation. An assertion is not an answer. It is the name of the place where an answer should be.

[00:07:26]The most sophisticated theological response to the first problem is the free will defense.

[00:07:31]And I want to take it seriously because it is genuinely serious.

[00:07:35]The argument is this: God is not responsible for human suffering caused by human choices.

[00:07:41]God gave human beings free will, the genuine capacity to choose good or evil because a universe with beings capable of real moral agency is more valuable than a universe of perfectly programmed automatons.

[00:07:54]The suffering caused by murder, cruelty, oppression, torture, this suffering is the price of free will and free will is worth it.

[00:08:03]I find this argument interesting and I want to follow it carefully because it does something in the first step that most people who use it haven't noticed.

[00:08:12]It concedes that there are things God has chosen not to prevent.

[00:08:15]It says, God could prevent this suffering but does not in order to preserve free will.

[00:08:21]That is a significant concession.

[00:08:24]It transforms the problem from a logical impossibility to a design choice.

[00:08:28]And design choices can be evaluated.

[00:08:31]So, let's evaluate it. First question, is free will actually incompatible with a world that contains less suffering?

[00:08:39]I can imagine a world where human beings retain every capacity for love, creativity, moral growth, and genuine choice, but where let's say one specific disease that kills children painfully before the age of five does not exist.

[00:08:53]The removal of that disease does not obviously eliminate free will.

[00:08:57]God could have written slightly different biochemistry and no free will is lost. Why wasn't that the design?

[00:09:04]The free will defense applies only to suffering caused by the choices of free agents. But a significant fraction of the world's suffering has nothing to do with human choice. And that is where the third problem lies and it is the one I find hardest to escape.

[00:09:19]Back in 30 seconds.

[00:09:21]This is the one I find most honest to sit with because the free will defense, whatever you think of it, at least attempts to address human cruelty. It has nothing at all to say about what philosophers call natural evil, suffering produced not by human choice but by the architecture of the physical world itself.

[00:09:39]In 1755, an earthquake struck Lisbon, Portugal on a Sunday morning.

[00:09:44]It was All Saints' Day.

[00:09:47]The churches were full.

[00:09:49]The earthquake, which lasted approximately 6 minutes, killed somewhere between 30,000 people. The fires that followed killed more.

[00:09:57]The tsunami that came after that killed more still. Thousands of those who died were children. They were in churches.

[00:10:04]They were praying.

[00:10:05]They were not in those buildings because of any human cruelty. They were there because it was Sunday morning and they were faithful. The Lisbon earthquake brought the intellectual confidence of 18th century European theology more thoroughly than any philosophical argument had managed.

[00:10:21]Voltaire wrote about it at length.

[00:10:22]Rousseau wrote about it.

[00:10:24]Kant wrote about it because the earthquake did something the free will defense cannot explain. It produced massive, indiscriminate, extraordinarily painful suffering that has no relationship to human moral agency whatsoever.

[00:10:36]And Lisbon is not exceptional. It is representative. The geological record of this planet is a record of earthquakes, volcanic eruptions, tsunamis, mass extinctions, suffering, and death distributed with absolute indifference to the virtue or innocence of the organisms that experience it.

[00:10:53]An omnipotent God designed the tectonic system of this planet.

[00:10:57]An omniscient God knew in advance every casualty it would produce. An omnibenevolent God, one who actually wants the best outcome for the beings in this creation, did not need to design a planet where the ground occasionally liquefies without warning under populated cities.

[00:11:15]That was a design choice. I tried and I want to be honest about this because I think intellectual honesty requires saying it explicitly, I tried to construct a coherent theological explanation for natural evil that preserves all three divine properties.

[00:11:29]I tried it from multiple angles over a long time.

[00:11:32]The most common theological response is that natural evil serves purposes we cannot understand, that there is a higher plan that makes even the deaths of thousands of children in a church on Sunday morning somehow necessary and good.

[00:11:45]And here is my problem with that response. It is not an explanation. It is an instruction to stop asking.

[00:11:51]It says, "Do not apply the standards you would apply to any other claim about a mind that makes choices.

[00:11:57]Do not ask what the mechanism is.

[00:12:00]Do not ask whether a being of unlimited power could have achieved the same purposes without the specific deaths of those specific children.

[00:12:07]Just accept that it was necessary."

[00:12:09]I cannot accept that.

[00:12:12]Not because I am emotionally unwilling, because scientifically and logically accepting a conclusion without being able to specify the reasoning that leads to it is not acceptance. It is surrender.

[00:12:23]And I have never been good at surrender.

[00:12:27]The fourth problem is the one that goes deepest, and it is the one that connects back to something my father told me on a walk when I was 12 years old. He said, "Knowing the name of something is not knowing the thing."

[00:12:38]And the name we give to the mystery of suffering in the presence of God is theodicy from the Greek, theos God and dike justice, God's justice, the justification of God in the face of evil.

[00:12:49]That is what the word means.

[00:12:51]And the word has been around for centuries, used by brilliant people.

[00:12:56]And that is exactly my problem. Because if there were an answer, a real answer, the kind of answer that survives the same scrutiny we apply to any other claim about the physical world, it would have emerged by now.

[00:13:08]20 three centuries is a long time to look, but there is a specific version of the fourth problem that I find the most difficult to escape.

[00:13:16]And it is this, not just that suffering exists, but that it is distributed the way it is.

[00:13:23]If you had an unlimited, perfectly good intelligence designing a universe, You would expect the distribution of suffering to reflect some moral structure.

[00:13:33]You would expect the virtuous to suffer less, the cruel to suffer more. You would expect the suffering of innocents to be limited in ways that correspond to some discernible logic.

[00:13:42]What the data shows, and by data I mean the full observable record of who suffers and how much and when is that suffering is distributed with no detectable relationship to moral virtue whatsoever.

[00:13:53]Children born into famine did not choose famine.

[00:13:56]People with genetic diseases did not choose their genetics. The population of Lisbon in 1755 did not choose to live above a seismic fault line. The distribution of suffering in this universe looks, to a physicist examining it empirically, exactly like what you would expect to see if the distribution were random, not designed, not purposeful.

[00:14:16]Random. And randomness in a universe governed by a perfect omniscient designer is not what you would predict.

[00:14:24]You would predict a moral structure in the distribution of suffering.

[00:14:28]It is not there.

[00:14:29]I tried to find it.

[00:14:31]I looked carefully.

[00:14:33]It is not there.

[00:14:35]The universe distributes suffering the way physics distributes outcomes in a system without an intelligent operator, according to probabilities, according to the local configuration of matter and energy, without reference to the moral status of the organism in the path of the wave.

[00:14:51]So, where does that leave us?

[00:14:54]Four problems that I tried to think my way around and could not.

[00:14:57]The logical impossibility you cannot have omnipotence, omniscience, and omnibenevolence in a universe containing any suffering at all without either lying about one of the three properties or accepting a logical contradiction.

[00:15:12]The failure of the free will defense to address the full scope of suffering. It only covers human cruelty and leaves the entire architecture of natural evil untouched. The problem of natural evil itself, a perfectly designed universe, does not need tectonic plates that kill thousands of innocent people without warning.

[00:15:29]And the distribution problem, the data looks like randomness, not moral architecture.

[00:15:35]What do I conclude?

[00:15:37]Here is where I want to be very precise.

[00:15:39]Because there are two different conclusions you could draw, and they are not the same. The first conclusion, the one I think the logic actually supports, is that the specific God described in the major theological traditions, the omnipotent, omniscient, omnibenevolent and personal God who designed this universe and cares about what happens in it, is not a coherent description of an actual entity. Not because I can prove such an entity does not exist, you cannot prove a negative about the whole universe, but because the description, when examined carefully, does not hold together.

[00:16:11]The concept fails the same way a theory fails when its predictions consistently don't match the data. The second conclusion, the one I do not draw, and the one I want to be careful not to draw, is that the universe is therefore empty, meaningless, that suffering is simply pointless, that the sense human beings have of something larger than themselves, the experience of what feels like contact with something real, is an illusion.

[00:16:35]I do not conclude that.

[00:16:38]I find I cannot conclude that honestly.

[00:16:40]What I find, when I look at what the logic actually shows, is something more interesting.

[00:16:47]The problem of suffering does not demonstrate that the universe is indifferent.

[00:16:52]It demonstrates that the universe is honest.

[00:16:56]The distribution of suffering matches the distribution you would expect from physics operating without a personal superintendent, but physics is not nothing. Physics is the most extraordinary structure human beings have ever uncovered.

[00:17:09]The laws that govern the universe, including the laws that govern suffering and death, are not arbitrary.

[00:17:16]They are mathematically beautiful.

[00:17:18]They are comprehensible.

[00:17:20]They are the same everywhere in the observable universe across 13 billion years of time and hundreds of billions of galaxies. The universe is not a designed moral system, but it is a coherent physical one.

[00:17:32]And there is something in that coherence, something in the fact that this universe, with all its suffering, is also the kind of universe that eventually produces beings capable of asking why it hurts, that I find genuinely remarkable.

[00:17:45]Not comfortably remarkable.

[00:17:48]The other kind.

[00:17:50]I think about David on that front step sometimes.

[00:17:53]His hands in his lap. The question he asked that the rabbi didn't quite answer.

[00:17:58]If God is perfect, why does it hurt so much?

[00:18:03]I have thought about that question for 60 years now.

[00:18:07]And what I want to tell him, what I think honesty requires me to tell him, is that the question is the right question and that the answer he was given, God has a plan, is not an answer.

[00:18:17]It is a name for the place where an answer would have to live. The universe does not offer us a plan.

[00:18:23]It offers us structure.

[00:18:25]It offers us laws that do not bend for grief or virtue or prayer.

[00:18:29]It offers us a physical reality so ordered and coherent that we can, after billions of years of molecular chemistry arranging itself into nervous systems, actually sit down and describe with mathematics how the thing works.

[00:18:41]That is not comfort.

[00:18:42]I know that is not comfort. But I have found, in a long career of following the logic wherever it goes and refusing to stop at the place where the answer gets inconvenient, that honesty is more durable than comfort.

[00:18:54]It survives things that comfort does not.

[00:18:58]David's question is still open.

[00:19:01]The universe still hurts. And the suffering is still distributed the way random physical processes are distributed, without justice, without design, without the specific shape you would need it to have if a perfect mind were behind it.

[00:19:14]I find that vertiginous, not peaceful.

[00:19:18]The way a correct calculation can be vertiginous when the answer is not what you wanted. But I also find, and I say this carefully because I mean it carefully, that a universe honest enough to distribute suffering without pretending it means something may be, in its own cold and extraordinary way, offering us something more reliable than a plan.

[00:19:37]It is offering us the truth.

[00:19:40]And the truth, wherever it leads, is the only thing my father ever taught me was worth following all the way to the end.

[00:19:46]If you stayed with me through all four of those problems, the logic, the free will defense, the earthquakes, the distribution, you are the kind of person who finds the universe more interesting than any story told about it.

[00:19:58]The next one goes somewhere I promise you have not expected.