No, the Universe can't "Just Exist"

"If you think God just exists without a cause, why can't the Universe just exist without a cause?"

There are several different problems with this commonly heard response.

One is that it fails to be responsive to the nature of cosmological arguments.  As I've said before, any cosmological argument will explicitly state some property P of things which need a cause, and conclude to the existence of something without that property P.

A second issue is that in traditional Natural Theology, proponents of cosmological arguments don't usually think that God "just exists" in the sense that he's a brute fact who freakishly exists, randomly and for no particularly good reason.  Rather, God is a necessary being who has to exist, by the very nature of "God" and "existence".  In this viewpoint, although God is uncaused, there is still a very good reason for his existence!  (And according to traditional Natural Theology, anything which "just exists" in this strong sense, would need to have a bunch of other divine properties as well.)

Suppose you think that some things have a cause and some things don't.  Then it seems reasonable to think that whether or not a thing needs a cause depends on what kind of thing it is.

But as soon as you admit this, you are committed in principle to accepting some sort of cosmological reasoning, even if you don't think the proper conclusion is Theism.  If Type A things don't need a cause, but type B things do need a cause, then it seems to me that if you work out these principles in a sensible way, you're ultimately going to end up with a hierarchical picture of the world: in which the type B things depend in some way on the type A things to exist, but not vice versa.  This implies that the existence of type B things should testify in some way to the existence and nature of the type A things.  And that's a cosmological argument!

Can we avoid this kind of reasoning by saying that "The Universe just exists"?  (Thus putting the term "Universe" in the category of type A things, that don't require an explanation.)

In my opinion, that statement is fatally ambiguous, so that it simply can't be accepted as meaning anything definite, unless further clarification is given.  Even if Naturalism is true, the cosmological argument demands a more complicated response than that.

The problem I want to highlight here arises from a very simple, and I hope uncontroversial fact:

"The Universe" refers to a collection of multiple things.

Of course, there are lots of collections of diverse entities which the mind can consider — your uncle's stamp collection; the ecology of all living species in the planet Earth; the natural numbers; the United States of America; the Grand Canyon; a deck of playing cards; a nuclear family; the "set" consisting of my left Big Toe and the Washington Monument; etc. Some of these entities have a natural or artificial "unity" that makes them function in certain definite respects as a single entity.  Others, are just random collections of entities, which we can still name linguistically as a collection, if we have some reason to do so.

Now the Universe is a really, really big collection of things.  In fact it is defined to be the collection of everything — or more precisely, everything that exists in the particular way that physical things exist.

The caveat is important.  Some might prefer to define the "Universe" to consist of everything that exists in any way whatsoever.  But then even God would be part of the Universe (assuming he exists at all, he exists in some way, even if that way transcends the way any of us exist).  And that would mean that an atheist couldn't express their Atheism by saying "Only the Universe exists" (because saying that wouldn't exclude God), nor could a theist express their Theism by saying "God created the Universe" (because God didn't create God).

Since such an unrestricted definition of "Universe" would be annoying for both theists and atheists, I take it that it is bad form to define it that way.  "God" and the "Universe" are sufficiently different that they can't be reasonably regarded as belonging to the same category of entity.  (Indeed, in a Monotheistic worldview, God is so unique that he can't really be categorized into a common category with anything else.)

Someone might therefore reasonably propose the following definition:

The Universe is the collection of every entity that exists in space and time.

(Some Naturalists might quibble about whether this "spacetime" criterion is the best way to pick out the class of entities they believe in; others might welcome it.  Most of what I say below won't depend on that.  The most important thing here is that the Universe is a collection.  And that now, if you say "The Universe is the only thing that exists", you are making a substantive claim, that could be right or wrong.)

Now, supposing someone claims "The Universe just exists", my question for them is this: what does it mean for a collection to "just exist"?  I would like to argue, that in order for an assertion about a collection to be a meaningful statement, it has to be made clear how the assertion relates to the individual members of the collection.

For example, America is a collective noun referring to a political union which (in addition to being a government, and the territory in which that government has legal jurisdiction) is also a specific collection of individual humans: namely those with American citizenship.

So if a political commentator says "We need to prevent America from dying", there are multiple ways this statement about the collective might relate to individuals.  The political pundit might be afraid of any one of the following outcomes:

(A) that all individual Americans are about to die (e.g. from a nuclear war or meteor strike that leaves no survivors);

(B) that some particular subset of individual Americans are about to die (e.g. from Covid-19);

(C) not that any specific American is about to die, but that some property held in common by many American individuals (like the "American spirit" or "American project" or "American respect for the Bill of Rights) is about to perish (e.g. if the country were in danger of becoming a one-party totalitarian state).

(D) that the United States federal government (i.e. the union which stands for Americans collectively) will formally cease to be (e.g. if all 50 states were to secede simultaneously, or if the government disbanded after being conquered by another country).

Of course a patriot would regard all four of these interpretations as bad news, but they are logically distinct meanings, even if some of them might imply or lead to each other.  A pundit who confused these outcomes with each other, would be guilty of mushy thinking.

So now let's consider this mushy slogan:

"The Universe Just Exists"

What does it even mean?  It seems to me that the options are similar to the case of America dying.  If you endorse this slogan, do you mean:

A) Every single entity in the Universe (e.g. rocks, trees, cats, galaxies, etc.) just exists, without any cause.

This interpretation has the advantage that, if it were true, it would be very reasonable to summarize it with the slogan: "The Universe Just Exists".

But it is also manifestly absurd.  If we pick this option, then nothing has an explanation, nothing makes any sense, and nothing we do can make any difference to anything else.  And yes that would also mean that Science is impossible.

B) Some specific entity or entities just exists, without any cause.

OK, in that case you need to tell me which specific entities these are.  In other words, you have more work to do before you've succeeded in expressing an actual philosophical position.

Once you have found whatever thing(s) X you think `just exists', it seems to me it would be much clearer to state your position as "X just exists", not "the Universe just exists".  After all, on this hypothesis, the Universe contains many other things, which are not X's.

If you pick this option, it had better be plausible that your X is able to give rise to all of the non-X's, without any features left over which X is unable to explain.  (And it would nice to have an account of which specific features of X, as compared to not-X's, make it reasonable to think they don't need a cause.)

C) No specific entity just exists without a cause, but something which these entities have in common just exists without a cause.

Again, you have more work to do here.  You need to tell me what specific common factor F you believe "just exists".  And whatever this thing is, since you've distinguished it from all the collected members of the class "Universe", it's unclear that your position will be best summarized by the phrase: "the Universe just exists".  You should say "F-ness just exists".

Of course, if you thought that F was a concrete entity existing in space and time, it seems you should have said "yes" to option B, rather than select this option.  To avoid (B), you are forced to pick one of the following 2 options:

1. the thing which "just exists" is not an entity at all, or
2. the thing which "just exists" is an entity that exists outside of spacetime

This puzzle is related to the fact that things which are held in common tend to be abstract qualities, e.g. both apples and fire engines can be red, so redness is an abstract quality rather than being a concrete entity.  If you are a Platonic or Aristotelian "Realist" who believes that abstract universals really exist in some transcendental or immanent way (a position I have some sympathy with), then maybe this is okay.  But if you are a hard-nosed Nominalist who doesn't like forms, then you might be in danger of implying this:

the factor F which "just exists" (and which explains everything else), doesn't actually exist at all in the way normal things do (except in a sort of purely conventional or descriptive way)

or shorter:

that which explains everything else by its existence, doesn't exist except in our minds

or more provocatively still:

that which exists most, exists least

which seems like a bit of a paradox!

Incidentally, if you think that the reason why the Universe doesn't need a cause is because of some infinite causal regress, then your position is probably best thought of as an example of position (C).   To give an example, an oak tree usually grows from an acorn dropped by a previous tree.  Darwin would say that trees evolved from simpler life forms, while Young Earth Creationists think the first oak tree was immediately produced by God without forebears.  But suppose, contrary to both of these views, that the Universe were infinitely old and that oak trees go back in time forever, in an infinite regress.  Then in this silly hypothetical, there would be a cause for why any particular oak tree exists, but it would seem there is no cause of why oaks as a species exist, nor is there a cause of why the arboreal nature which is common to all trees is instantiated in the world.

As a Theist I would say, that is still a rather peculiar and interesting fact, which I would like to have an explanation for.

If a Naturalist thinks that the most basic reality is the laws of physics (as I've previously suggested is the most plausible form of Naturalism), then this might also be regarded as a form of option (C).  Note however, that the laws of physics would transcend space and time (in the sense that they hold equally in all times and places) and on this view they would also seem to transcend the distinction between abstract reality and concrete reality (since they take the form of mathematical equations, but they also govern the universe).

D) No specific entity exists without a cause, but collectively they form a united whole which, considered in this collective identity, exists without a cause.

This option was supposed to be parallel to the "United States government" option for "America", but I confess I'm have some difficulty making much sense of it as applied to the subject "the Universe" and the predicate "just existing".

First of all, it is not clear whether the Universe, which is after all just about the broadest category there is, has any collective identity above and beyond the coexistence of the individual entities which exist within it.

If it does have some collective identity, it's hard to see how that collective identity doesn't depend on the individual parts to exist.  If you try to make a brick house, but you don't have any bricks, then you won't be able to build the house.  But if something depends on other things to exist, then it doesn't "just exist", now does it?

(Otherwise, if the identity of the Universe didn't depend on the parts in any way, such that it could exist even if none of its parts do, then maybe the thing you have in mind isn't a collection of entities at all, and you should have called it "God" instead of "Universe"?)

Of course if you just replace a few of the bricks from a house, you could still have something that might recognizably be considered the "same" house.  Just as individual Americans can die (in fact everyone who was alive at the founding has died, and been replaced by new generations) without the United States of America ceasing to exist.

But, if it is coherent to say that the USA of 1790 is the same as the USA of 2020 (or a counterfactual USA which lost the Civil War and had fewer states), then it must be true that there is some abstract feature, which is common to all of these versions of the USA, and which makes them the same.

Similarly, we could imagine the history of the universe turning out differently.  E.g. imagine an possible world W' in which the Solar System had never formed.  We can now ask, does W' count as the same "Universe" for purposes of the slogan, as the actual world W?

(To some extent this is an ambiguous question.  You can define "this Universe" however you like, and there may well be fuzzy boundaries about exactly when normal people would count a universe as the "same" or "different".  But the relevant question is this: is there any specific way to define "the Universe" that makes the slogan "the Universe just exists" true?)

If W and W' count as distinct Universes, then it is neither W nor W' which you are specifically asserting "just exists", but rather some common aspect which is the same for both W and W' — and that pushes us back into option (C), or maybe (B) if there are some spacetime entities which exist in all possible worlds.

If on the other hand, we interpret "Universe" in the slogan sufficiently narrowly that any changes to W would make it no longer count as the same universe — then in that case asserting that the Universe just exists, means asserting that W obtains as a brute fact, where W implies that every single thing in the universe is exactly the way it is.  But in that case it seems that the slogan implies (A), which is still absurd.


In conclusion, every single interpretation of "The Universe Just Exists" that I can think of seems to be either absurd, or else it uses the word "Universe" to refer to something far more restricted and definite than what it is normally taken to mean.

Thus, my message for Naturalists is simple:

1. The Universe can't "just exist"

2. So something else must exist without a cause

3. Come back when you think you know what it is,
and then we can have a real conversation about the
Cosmological Argument.

About Aron Wall

I am a Lecturer in Theoretical Physics at the University of Cambridge. Before that, I read Great Books at St. John's College (Santa Fe), got my physics Ph.D. from U Maryland, and did my postdocs at UC Santa Barbara, the Institute for Advanced Study in Princeton, and Stanford. The views expressed on this blog are my own, and should not be attributed to any of these fine institutions.
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8 Responses to No, the Universe can't "Just Exist"

  1. I appreciate this post as I appreciate the majority of your posts. Thank you and I hope you finish your earlier series.

    What I was hoping for you to address as I read this post, and what I feel that you didn't address, is Pantheism. This stands out because of history (notably Spinoza and Einstein) and because, at least in my experience, many physicists, at least when speaking in private, will express sympathies towards Pantheism while openly opposing Theism.


  2. Mr. C says:

    Apparently, you've raised this question before, but what are your thoughts considering the omnipotence paradox? There's a very nice rebuttal of it here ( and also, but it implies that God does not necessarily exist. Do you have any thoughts on it?

  3. Aron Wall says:

    All of these arguments are completely misguided, for several different reasons:

    1. This account of omnipotence as the ability to make any proposition true, is not how omnipotence was traditionally defined. For an account of the philosophical history, see here.

    2. Even on a more modern account, God's power should be defined to only extend to that which is intrinsically possible to be done. God causing a logical contradiction to obtain, is not intrinsically possible. Therefore, God's power does not extend to it.

    If we take modal logic seriously enough to use it to argue against God's attributes, we also need to take it seriously enough to include it in our ideas about what counts as "intrinsically possible". In particular, in S5 modal logic, all modal statements are themselves necessary; i.e. \Diamond P implies \boxempty \Diamond P and \boxempty P implies \boxempty \boxempty P. Hence, no being whatsoever has the power to make such modal statements true or false; it follows that this is not the sort of thing we ever mean when we talk about "power". For example, if I go to the store at noon, that act does not remove the fact that counterfactually it was possible for me to not have gone to store, and it is hard to see what it would even mean for me to have the power to remove that possibility. I can of course take actions which preclude me going to the store (like being somewhere else during the relevant time period, or promising that I won't go while being the sort of person who always keeps my promises), but that doesn't change anything about what I hypothetically could have done, had I not taken those actions.

    3. Logical possibility should also be distinguished from real possibility (also called 'metaphysical possibility'). The mere fact that we humans don't see a contradiction in a certain state of affairs, does not imply that it is really possible. There is no reason to believe the human mind is capable of perceiving every type of impossibility. Therefore, the fact that a statement is logically possible (i.e. that the human imagination does not detect a contradiction in it), does not imply that it belongs to the set of intrinsically possible outcomes.

    4. To quote from the first link:

    The problem, in other words, arises with the mistake, common among analytic philosophers today, of thinking that arguments and claims just spring out of nowhere and therefore don't need anything other than themselves in order to be understood properly. In actual fact, the interpretation of arguments and claims must be constrained by the reasons for putting them forward in the first place.

    Thus, if your reason for believing God is omnipotent is from philosophical theology, then you need to examine your reasons for thinking God is omnipotent, and doing this will guide you to seeing how to resolve these issues.

    And if your reason is from Scripture, then you need to see how the doctrine of omnipotence functions within the canon of Scripture, and let Scripture qualify your account of what omnipotence means.

  4. Mactoul says:

    Though you expressed hope that your definition of universe as a collection of things will not be controversial I would like to remark that the essence of the term universe is that it is one--it expresses a certain unity --that the said unity is far from obvious.
    Consider the currently trendy multiverse and the older idea of island worlds, later figured out to be part of our universe.
    I refer you to the writings of Fr Jaki.

    Again, your argument that there are things like rocks, planets etc have a cause that makes them to exist so the universe must also have a cause.
    But it can be argued that there are no such things -- they are just collections or heaps of actually existing things aka fundamental particles which are causeless.

  5. Mactoul says:

    Classical arguments proceed from premises that are undercut by modern physics (or some interpretations thereof). For instance, the substantial unity of things. Do you believe that living things possess substantial unity, are they substances in Aristotelian sense? Or do you call this view outdated and unscientific vitalism?

    In modern physics there are only quantum fields or fundamental particles which came into existence with Big Bang and thus do not require any further cause. Everything else is just accidental heaps of these fundamental particles and heaps do not require any cause.

  6. I think the meaning of "cause" relies on a context-dependent background framework of which things can be implicitly accepted. For example, "The paperclip moved because there was a magnet" may be a satisfactory explanation to someone who accepts that magnets works but wanted to know how objects were arranged around the paperclip, but it won't be satisfying to someone who wants to understand how/why magnets work. Discussions of the cosmological argument or the question of why there is something rather nothing are seeking out an "ultimate" cause, a cause in the empty background framework, a cause that does not presuppose anything else. I do not believe ultimate causes exist. This is unsatisfying, and if there were such an ultimate cause I would like to know but it, but I spend little time seeking it out and I do not accept arguments based on the assumption that an ultimate cause exists.

    To fit this in your classification, in terms of ultimate causes I believe A, that every individual object does not have an ultimate cause. This does not render science impossible. Science involves noticing patterns in the universe, building frameworks for these patterns, and explaining things within these frameworks. The universe does have patterns: Partly we know this from observation, and partly we believe this for things we haven't observed from extrapolating from what we have observed. So science has been possible up to now, and we believe it will continue to work in the future. Just as science is based on causes but does not require ultimate causes, our desire to affect our surroundings does not require the effects to be transcendent and independent of anything else but merely that we accept an ability to perform actions and incorporate it in our planning.

  7. Unrelated to my last comment, I want to question your own views about initial causes in light of other posts you made. How does your belief in free will affect your thoughts on the simplicity or unity of any first cause(s)? (I was sure you believed there is a singular and unified first cause, but I couldn't find a specific blog post that was a good reference.) Isn't each act of free, by definition, an uncaused cause? These aren't causes for an entity to come into existence, as this blog post is concerned with, but they are still causes for why they the world is the particular way it is. I don't mean why that Alice has the free will to go either left or right, which you presumably attribute to a dispensation from God, but, given that she has free will, why did she go left or why did she go right. Any sufficient cause other than "Alice chose this" is a denial of her free will. And yet, if no act of free will has a sufficient cause, that is a huge number of separate events that are necessary in explaining the way the everything is, rather than a single simple uncaused causer.

  8. Matt says:

    To me this was amazingly well written, so thanks for this.

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