Being pedantic about faith

Is it possible to verify that Christianity is true using philosophy?

Aquinas thought that we could prove using philosophy that God exists, that God has all the “omni” attributes normally associated with Him, that God is the first cause of everything, that God keeps everything in existence from moment to moment, that God is conscious and intelligent and designed the world around us, that the human race exists in order to know God and so on. All that using human reason rather than just faith.

However, Aquinas did not think it possible to prove the Christian faith using philosophy. So Christian teaching about the nature of God, about Jesus and the trinity and so on cannot be verified by philosophy.

Is it possible to verify that Christianity is true using evidence?

If by “evidence” we mean scientific evidence, the answer is clearly no, but there are other kinds of evidence.

Is there any other kind of evidence that could satisfy a sceptic? The question calls to mind tedious online arguments we have all witnessed between Christians and atheists. You felt something? Feelings aren’t evidence. You had a dream? Power of suggestion. You had a vision? A hallucination. Your prayer was answered? A coincidence. You were healed? Placebo effect. Your cancer was healed? Cancer goes into remission by itself all the time. You had shrapnel embedded in your knee and it disappeared for no discernible reason, and you have medical documentation for before and after, and the doctor had no idea how it happened? You’re crazy!

There’s a lot that could be said and it’s not as though the sceptics don’t make some good points. Nevertheless I will ask what I believe to be a more interesting and important question: Can a religious claim be empirically verified in principle?

Consider the following scenario: you have been transported back in time and find yourself standing in Jesus’ tomb. Assume you know 100% that this is really happening and that the dead body in front of you is really Jesus. You check and he is, with 100% certainty, dead. Then to your astonishment, he rises from the dead while you are watching. Do you now know with certainty that Christianity is true?

No, you don’t. Why? Because while you know that Jesus just rose from the dead, you don’t know what to do about that. (The early Christians weren’t sure what to do about it either.)

Therefore empirical verification of any religious claim is not possible. There will always be a leap of faith required.


Where’s the evidence?

Evidence. Evidence. Where is the evidence? Show me the evidence or I won’t believe. Such is a typical response of the modern atheist when asked why they don’t believe in God.

By “evidence” they mean empirical evidence; the kind of evidence used by science. Now, empiricism as a starting point to validate truth claims has a long and distinguished history. So how far can empirical evidence get us? Let’s find out what it can’t get us.

The following is a short, non exhaustive list of stuff almost everyone believes in but for which there is no empirical evidence:

Objective reality. When you sit on a chair, you don’t know empirically that the chair exists; all you know is that your mind is giving you the experience of sitting on a chair. To know that the chair has mind-independent reality, you need to go outside your mind to check. Good luck with that.

Causation. Have you ever seen a cause? No. You see things happen after other things, then your mind infers that causation is there. So causation could be illusory, or you might not understand it. Perhaps no one does.

Other minds. You know that you have an inner consciousness. You don’t know that anyone else does. Have you ever seen anyone else’s consciousness? Is it valid to extrapolate from yourself to everyone else in this way? After all, you are a small sample size.

Morality. To say that anything is right or wrong presupposes that there is an objective standard that whoever you are criticising should adhere to. Where is this standard? Can you prove empirically what standard we should use?

Human logic. If the mind evolved, how do you know that this has progressed long enough to produce anything useful? It might take another million years for all you know. Future humanity might consider our science and mathematics a laughing stock.

Abstractions. Abstractions such as “truth”, “knowledge”, “circle”, “hypothesis” and so on do not exist empirically, so how do you know it makes sense to use them? You don’t.

Mathematics. Prove empirically that 2-5=-3. Should be easy. Start with 2 apples, take away 5, for a total of -3 apples. Now pick up one of your -3 apples and eat it. You have successfully proven mathematics empirically. Congratulations.

The past. Your memory is reliable, or is it? Can you go back to check?

History. Was Julius Caesar assassinated? Can you prove it empirically, rather than from dusty old books?

Love. “I love you!” Really? Show me the evidence.

Any empirical fact you can think of will necessarily be based on assumptions such as the above that can’t themselves be proven empirically. For example, to say “I just saw a cat outside my window” assumes a world outside your mind, that you weren’t hallucinating or dreaming, an ability to recognise cats, an ability to construct sentences correctly, the reliability of your memory etc.

Any scientific idea will add on more assumptions, as it must assume that the world is comprehensible both in itself and to us, that scientific concepts such as “hypothesis” and “falsification” make sense, that causation is real and so on. The deeper the level of abstraction, the more ideas must be assumed.

Let’s look at causation for a moment. Science assumes that causation is real but doesn’t tell us how. If for example matter is made of ideas in the mind of God (I am not making this up), then what we think of as physical causation is actually connections between ideas in God’s mind, and all science is theology – and the evidence can’t tell us otherwise. Another example: what if our minds told us that causation works backwards? If they did, no doubt our science would include not evolution, but devolution; not natural selection, but natural unselection – and again, the evidence wouldn’t tell us otherwise.

It follows that there is no such thing as a purely empirical fact. To put it another way, any empirical fact is a non-empirical sundae with an empirical cherry on top. If the non-empirical sundae is wrong, the empirical cherry won’t make it right. Likewise, if the non-empirical sundae is correct, it will still be correct without the empirical cherry.

Looking at examples of empirical evidence only reinforces this point. When I think of empirical evidence, I think of (say) finding fossils in the ground. But it gets a lot more esoteric than that. Consider the following from this paper about the Higgs boson:

Correspondingly, the signal strength relative to the expectation for the standard model Higgs boson is found to be 0.78 ± 0.27 at the Higgs boson mass of 125 GeV. Earlier, the CDF and D0 experiments at the Tevatron reported, for mH = 125 GeV, an observed (expected) 95% CL upper limit of 7.0 (5.7) times the standard model expectation.

Such statistical methods stretch the definition of “empirical” to breaking point.

This means there can be no hard boundary between science and other types of knowledge. Therefore if the success of science gives you confidence in science (and why not), it should also give you confidence in the non-empirical aspects of human thought.

Fine. Now what?

Where to proceed from here?

No one is an acausationist who won’t believe in causation until someone shows them evidence for it, nor does anyone argue for it; it’s just assumed. If the human instincts that evolution has given us about causation, time and space, other minds, objective reality, abstract thought etc should be accepted without argument or evidence, and evolution has given us an instinct to believe in God, you are also fully justified in believing in God without argument or evidence.

What you cannot do is reject anything solely because you believe it has no empirical evidence. If you do, you must also reject the entire above list – objective reality, causation, other minds, the validity of human logic, morality, abstract thought, history, mathematics. 

Clearly that cannot be done. A consistent empiricism is therefore a complete non-starter. The challenge, then, is to find a more balanced approach that takes into account human instinct and logic rather than just empirical evidence.

Introducing Approximatism

I don’t have all the answers, but my own take is this: all the basic human instincts about reality are approximately true. Why all?

Since all human knowledge is ultimately based on unprovable instincts, it makes no sense to use half those instincts to attack the other half as unprovable. Secondly, whatever instincts we have ultimately came from the same source, so there is no basis for privileging one over another. There are only two consistent positions available to us: we assume they are all true and proceed on that basis, or they are all false and all human knowledge is fiction.

So if we are to avoid a scepticism of everything, the role of logic and evidence is to show us exactly how our instincts are true rather than trying to overturn them.

The problem of suffering and evil

It is commonly argued that there cannot be an all-knowing, all-powerful, good God because there is so much evil and suffering in the world. Is this true? If God exists, how are we to understand suffering and evil?

I’ve always held that problem of evil is not something you can consider while deciding if God exists. A good God could have any number of reasons for allowing evil, depending on what He is like. Therefore there is no contradiction in a benevolent God allowing evil, but you can’t address the question if you don’t even know if He exists or not.

So for this post, I will assume that Aquinas’ arguments for God’s existence are true and take it from there. (Read more about those at Aquinas Explainer: The First Way and The Fifth Way.) This means that God is a conscious, immaterial mind that holds everything in existence and enables everything that happens from moment to moment as a First Cause.

Aquinas holds that evil is a privation – it does not exist on its own, but is parasitic on the good and acts by attacking or distorting the good. Since God was before everything else, He must have been originally good and the only way He could be evil is by attacking or distorting Himself, which is impossible. Therefore God cannot be evil.

If God as First Cause is enabling all our choices, what does that mean? Since God is keeping everything in existence and being the First Cause of everything from moment to moment, He is in some sense enabling every good thing that ever happens – every opening flower, every baby being born, every sublime piece of music or art, you name it. But in the same way, He is in some sense enabling every evil thing that ever happens – every murder, every rape, every genocide.

That’s disturbing, but if God cannot possibly be evil he presumably doesn’t like evil. So why is he constantly enabling every evil thing that ever happens? That’s the big question here.

Evil and choice

Whatever else you might say about it, evil is a byproduct of choice. Choice is the world’s most multifaceted tool. You can choose to cook lasagne, study mathematics, start a hairdressing apprenticeship, buy and sell, go to work, plan finances, take the day off work, learn painting, read a book, attend a Mozart concert, give blood, play cricket, get married, have children, invent, build, rest and so on. We choose all these things because they seem good to us – we need them or they bring joy to our lives.

So if you choose to torture someone, and liaise with other torturers to refine your torture techniques and make them more agonising, thus increasing your pleasure from hearing your victim’s screams, is that not an example of human creativity and ingenuity, just like other choices? Also, isn’t the underlying motive the same as other choices – in this case, to gain pleasure?

If evil is not a thing in itself but a distortion of the good, and is a byproduct of the human capacity to make choices, how is God to get rid of it?

A knife can stab or it can chop carrots. If you made knives safe, they would no longer be knives.

The easiest way for God to annihilate evil would be to annihilate the human race.


Cancer. Rocks falling on people’s heads. Drowning in a tsunami. The list of sufferings is endless.

Some group suffering together with the problem of evil, but this doesn’t make sense to me. A tsunami, a rockfall or cancer, bad as they can be, have no agency. They are bad for us but how can something with no will of its own be evil?

Should He exist, can we critique God based on suffering? To answer this question, we must ask another – what are we expecting God to do? What should He have done otherwise?

To my mind, it is hard even to imagine a material world without suffering. For example: a rock falling on someone’s head, killing them. Why do such things happen? It is because matter has weight and mass, and this because of gravity. Objects falling on smaller, less dense objects damage them for this reason.

So to ask that such sufferings not happen, what we are really asking is that gravity be switched off. Or that gravity exist but not when we are around. Or for gravity to exist but not when I say otherwise, thank you very much. (Are we entitled to this? Why?)

The same thing applies to other sources of suffering. To have a physical body is to be vulnerable to damage by other physical things, so that a material world without suffering is inconceivable. So ultimately the question becomes: should God have created the material world in the first place? Is it worth it?

If God exists, it seems He decided it was worth it.

Is there an ultimate meaning to suffering and evil?

I assumed at the start of this post that God is as described by Aquinas, the First Cause of everything that happens, who keeps everything in existence from moment to moment; who designed the natural world and is responsible for the order we see in it; who is good; who is in everything that takes place; who is constantly making decisions about what to let happen and what to deny; who is rational and does this according to His own plan; who created the human race to know Him.

If this is correct, it follows that all aspects of the world we see around us have meaning; that all aspects of human existence are meaningful. Even the most horrific sufferings that we experience because of evil and the predations of nature ultimately have a reason. So cancer and earthquakes, terror famines and the Holocaust all have meaning – even when this is incomprehensible to us.

This is a difficult thing to accept; no doubt many atheists would see this as demonstrating the absurdity of theism. Some sufferings kill or drive insane their victims. It just seems over the top. What value could there be in such things?

I read an extraordinary book recently: “Man’s Search For Meaning” by Viktor Frankl. Frankl was a Holocaust survivor and a psychiatrist, who observed what he saw in Hitler’s camps and applied it to the human experience more generally. He invented “logotherapy”, or meaning-based therapy. I hope to write a post on it, but meanwhile here are a couple of choice quotes from his book:

We who lived, in concentration camps can remember the men who walked through the huts comforting others, giving away their last piece of bread. They may have been few in number, but they offer sufficient proof that everything can be taken from a man but one thing: the last of the human freedoms — to choose one’s attitude in any given set of circumstances, to choose one’s own way. […] It is this spiritual freedom — which cannot be taken away — that makes life meaningful and purposeful.


We had to learn ourselves and, furthermore, we had to teach the despairing men, that it did not really matter what we expected from life, but rather what life expected from us. We needed to stop asking about the meaning of life, and instead to think of ourselves as those who were being questioned by life—daily and hourly. […]

Once the meaning of suffering had been revealed to us, we refused to minimize or alleviate the camp’s tortures by ignoring them or harboring false illusions and entertaining artificial optimism. Suffering had become a task on which we did not want to turn our backs.

Gulag survivor Aleksandr Solzhenitsyn had similar insights.

Our culture treats pain and suffering as a dead loss, with no meaning in it. Why is this? To my mind, it is because we see no meaning in life generally. It makes no sense to say that life has meaning, but only when it is pleasant.

If belief in God gives us confidence that life has meaning in itself, it should also give us confidence that all aspects of life have meaning – including suffering and death.

Further reading

Man’s Search For Meaning – Full text available at

The Brothers Karamazov – Dostoevsky provided one of the most evocative portrayals of the problem of evil ever set to print.

Unbroken and the problem of evil – A discussion of the problem of evil from a Christian perspective, by philosopher Edward Feser.

Science, suicide and the catastrophic spider

To understand the past is to understand the present. So for this post, let’s take a brief look at the history of Western thought, starting with Descartes, who rebooted philosophy 400 years ago, replacing Aristotle.

Descartes’ main contribution was this: science defines the material world. (This is common sense nowadays, but it originated with Descartes.) In his view, the natural world is like an enormous machine; a “clockwork universe”. Descartes also held that the human mind, including consciousness, was immaterial and separate to the body.

Descartes did not provide any account of how human knowledge was possible; he simply assumed that it was. This would have consequences, as we shall see.

Descartes’ immediate successors can be grouped into two categories; the rationalists and the empiricists.

The Rationalists

Spinoza was a determinist. He held that free will was impossible and that God and Nature are names for the same underlying reality – “God” here meaning the deterministic system of which everything is a part. He said that good and evil are relative rather than absolutes. He opposed Cartesian dualism, stating that if mind and body were separate, it was hard to see how they could interact – the interaction problem.

After Spinoza came Leibniz, who invented calculus independently of Newton. He was an optimist. He held that this is the best possible universe God could have created. He invented parallelism – preestablished divine harmony between matter and mind – to solve the interaction problem.

Malebranche attempted to solve the interaction problem by means of occasionalism – the belief that mind cannot act on body or body on mind, but that God mediated between both.

The Empiricists

Descartes’ method had been one of doubt; doubt as much as possible, before rebuilding. The Empiricists followed his lead, by playing Let’s See Who Can Doubt The Most Stuff.

Locke said that all of our ideas are derived from the senses, so that our knowledge is limited; we can’t know the primary qualities of things, but only their secondary qualities (such as colour or taste).

According to Berkeley, objective reality cannot be empirically verified and therefore doesn’t exist. Rather, to exist is to be perceived subjectively by a mind. The world only exists because God is perceiving it.

Hume was the logical endpoint of empiricism and scepticism. He is much loved by Internet atheists for demolishing religion, but he didn’t stop there. Hume demolished science! Hume demolished causation! Hume demolished time and space! Hume demolished philosophy! Hume demolished Hume! Hume’s method for each of these was the same; all knowledge comes via the senses, but the senses tell us about rocks, trees and cats, not about time, space, causation, scientific logic, religion or philosophy. Hume either swept away the cobwebs of superstition or demonstrated the absurdity of any consistent scepticism, depending on who you talk to. Hume left philosophy in crisis. He appalled and perplexed everyone. Everything was demolished. Who could save philosophy now?

The catastrophic spider

Enter Kant. He answered Hume with a complex account of how human knowledge was possible. According to Kant, we don’t see the world-in-itself but rather the world as it is structured by the mind, the world-to-us. Since we can never get outside our minds, the world-in-itself is forever closed to us, and it is unknown if and to what extent the world-to-us is accurate. We can do science, but all we are studying is the world-to-us.

We can never answer the Big Questions about God or metaphysics, because they are part of the world-in-itself but not the world-to-us. On this basis, Kant dismissed all proofs of God’s existence as invalid. (Lest you get the wrong idea, Kant was a devout Catholic.)

Kant’s influence was huge; second only to Descartes. But ultimately it was his formulation of the problem of human knowledge, rather than his solutions, that would be remembered. To get an idea of his legacy, it is said we live in a “post-Kantian wasteland”. Nietzsche called Kant a “catastrophic spider”. Kant’s successors can be (roughly) grouped three ways; the idealists, the existentialists and ultimately the materialists.


If you can explain all human knowledge in terms of the world-to-us, what need is there for a world-in-itself? Perhaps mind-reality is the only reality.

According to Hegel, history is Mind seeking to understand itself. The good news? Mind would one day understand everything. How inspirational is that? I’m inspired. Who else was inspired by Hegel? Karl Marx. Marx invented Communism. Communists killed 100 million people. The lesson here? Don’t do philosophy; it’s too dangerous.

Ultimately an increasingly secular West would reject Hegel as being too mystical.

Absurdity and despair

Next, the existentialists. Since the world-in-itself could not be known, the quest for knowledge is futile. Philosophy was spooked from asking big questions and instead slid into despair.

Schopenhauer held that human desire is illogical and directionless. Birth only brings into existence a new occasion for suffering and death. What is real is the Cosmic Will but the Cosmic Will is evil.

Nietzsche coined the phrase “God is dead”. According to Nietzsche, the end of Christianity will bring in a period of amorality and chaos as our morality moves away from Christian “slave morality” with its pity and compassion, until a new morality is established. (Nietzsche went insane before his death, shortly before the First World War broke out.)

The Existentialists said that human freedom leads to dread and despair. The quest for knowledge is hopeless. Life is “the nauseating quality of existence”. We are condemned to look for meaning in a universe without it. Life is absurd and the only thing to do is embrace the absurdity.

Camus said that the only philosophical question worth asking is: Should I kill myself? (His answer was “no”, but still.)

Language-games and science

Pragmatism held concepts to be useful instruments rather than anything true or false.

Wittgenstein presented language as having meaning only within a “language-game” and meaningless outside it; the point of language is not to be true or false but to be understood by other players of the language-game. Wittgenstein regarded language as a cage; its imprecision makes philosophy impossible.

Parallel to this, a movement was afoot to make philosophy more like an intellectual discipline that wasn’t chewing it off its own feet; namely, science.

This can be seen as the final response to Kant. If we can explain everything in terms of the world-to-us, then the world-to-us is the world-in-itself and that is all there is; no need for God or metaphysics. This would lead inexorably to materialism in its various guises. Materialism holds that mind is really matter, although like all modern philosophy it defines both “mind” and “matter” in Cartesian terms.

Because no one pays attention to philosophy, few are aware that materialism has run into a number of intractable problems that cannot and will not be overcome.

In my view, the failure of modern philosophy to pin down the basic nature of reality shows that it’s Cartesian foundations are faulty. Build on top of a faulty foundation and things may seem fine at first; as more storeys are added, cracks appear and the building starts to shudder. The only solution is to demolish or wait until the collapse.

It is my opinion that the Cartesian conceptions of mind and matter are both incorrect. Given that, it hardly matters which way you connect the puzzle pieces. Whether mind is really matter (materialism), matter is really mind (idealism) or mind and matter are separate (dualism) – all of these will fail if the definitions of “mind” and “matter” are wrong in the first place.


Between language-games and materialism, half of philosophy was claiming that philosophy was impossible and the other half was claiming that science would provide the answers. Not without reason, the West decided philosophy no longer merited our attention and philosophy was locked inside its ivory towers.

Once, philosophers were household names. As late as 1922, Einstein debated a philosopher on the subject of time, and the public was riveted. Imagine that happening today.

Things are different now. Science is king and philosophy is an irrelevant sideshow. But this has its consequences; Western thought has atrophied. The West scarcely knows how to ask the big questions any more, let alone answer them.

An exhausted, jaded Western world awaits its Socrates


Socrates. Plato. Aristotle. These are the big names of Ancient Greek philosophy, of which Aristotle was the most influential. Together with philosophers they inspired, such as Aquinas, Plato and Aristotle would dominate Western philosophy for 2000 years, before being discarded by Descartes and the other early moderns. Read on to find out more about Plato and Aristotle and why they are still important today.

The Pre-Socratics

Some 2500 years ago there was a broad materialist trend in Ancient Greek philosophy. Over a few hundred years, the Greeks had moved from mystical, polytheistic philosophy to materialism and atheism. This culminated in atomism, which held that the material is all made of basic particles called “atoms” and that is all there is. The Sophists, another school of philosophy, taught that all thought was based on the senses and that truth is a matter of convention. Another ancient philosopher, Parmenides, said that time is an illusion and change is impossible. Do your senses tell you otherwise? Your senses are wrong!

All this led to a crisis, as the atomists could not explain how human knowledge was possible. For material things are constantly changing, so if the material is all there is, as soon as you understand something it changes and you don’t understand it any more. The Sophists taught their students to use any argument that was useful even if it was known to be fallacious; thus bringing philosophy into disrepute. More broadly, so many different positions and arguments had been advanced that many despaired of coming to any sort of consensus about the truth.

All this coincided with a broader crisis in Athens, as the elites were perceived as acting against the interests of broader society, bringing Athenian institutions and democracy into disrepute.

Does all this seem familiar? Am I talking about Greece in 500BC or the West in 2017?

The Socratic revolution

But this wasn’t the end. Socrates pulled philosophy from the abyss by re-imagining it not as just an intellectual exercise but a practical quest to understand how to live a flourishing, virtuous life. Socrates was executed, but according to Plato he was untroubled, convinced by his own philosophy not to fear death. Plato was Socrates’ student and Aristotle studied under Plato. As noted, they dominated Western thought for 2000 years.

Now, how can philosophy tell us how to live a flourishing, virtuous life? A nihilistic philosophy that denies that truth, goodness and wisdom exist cannot do this, that’s for sure. How can we know truth, goodness, wisdom?

How can we know anything? According to Aristotle, it is because the abstractions that the mind uses to think also exist in the objects the mind understands. These abstractions are called “forms”. Forms can be thought of as the organising principle of something; the prototypical forms for Plato were those of mathematics, so a form is something like a mathematical blueprint. No matter exists without a form; a material substance is composed of form and matter together. To understand something is to understand its form.

Closely related to this is essence, defined as whatever makes something what it is. For example, the essence of a knife is to have a sharp blade that can cut things. A knife can be made of steel or wood or hard plastic, so the essence of a knife (and thus it’s form) is logically separate from the matter it’s made of.

Just as the forms of material things exist objectively, so do abstractions such as truth, goodness and being – which are all the same thing considered from different points of view. What is good morally speaking also exists objectively, as a subset of what is good for us as rational animals. Following from this is “virtue ethics”, which emphasises the moral virtues of the agent as opposed to the consequences of their actions. Key themes in virtue ethics include virtues (duh), happiness, moral character and practical wisdom.

Then there are four types of causation. Efficient causation is that which creates something. Material causation refers to what the thing is made of. Formal causation refers to its form. Final causation refers to the reason why it exists.

Everything that exists needs all four types of causation to describe it. An example might help. A soccer ball was made in a factory – its efficient cause. It is made out of polyester and rubber – its material cause. It has the form of a ball – it’s formal cause. It is made for use in soccer matches – its final cause.

But what does it mean to say that everything has a final cause? Take water as an example. Water always boils at 100 degrees and never at 75 degrees. From this, it is said that water is aimed at or directed to boiling at 100 degrees. Thus it has the purpose of doing so. This purpose is internal to it, rather than being directed from outside and is not a conscious purpose, as water never consciously purposes anything. This is known as intrinsic teleology.

Final causes are also tied to Aristotelian ethics, since final causes tell us what is good for us as human beings, which is a subset of goodness generally, and is a guide to goodness in a moral sense. For example, since the final cause of our intellect is to discover truth, it is good for us to communicate truth and morally wrong to tell lies.

Aristotle explained change with the concept of potentials. For example, water is liquid but has the potential to become gas if you heat it. States that exist now are “actual”; ones that could exist but don’t are “potential”. Change is something moving from potential to actual.

To summarise so far: actuality and potentiality, form and matter, four types of causes, virtue ethics and intrinsic teleology. The metaphysical menagerie is now done. If you’re encountering all this for the first time, you might be feeling a bit lost. Never mind; the post must go on!

The forms of living things

According to Aristotle and Aquinas, the soul is the form of a living thing. Now don’t get too hung up on that word “soul” – the soul is still merely an abstraction. It comes in three kinds.

The first and most basic is a “vegetative soul”, which is the kind that plants have. The second is the “sensitive soul”, which animals have. It includes consciousness and self-movement on top of what a vegetative soul has. Consciousness on this view is entirely material. (By contrast, Descartes thought that consciousness is immaterial and that animals do not have it.)

The last and final kind is the “rational soul” that humans have. It includes rationality on top of what an animal has, making us “rational animals”. To be rational is to comprehend forms. But the forms are not themselves matter, and matter cannot contain the non-material, so rationality must be immaterial – therefore it must be a form, in this case a “subsistent form”. So the rational soul is not just an abstraction, for our rationality must reside in our form rather than in matter.

This is quite different to Cartesian dualism in a couple of ways. Descartes said that we are thinking beings and our bodies are almost optional extras. But according to Aristotle we are rational animals, so our bodies are just as important to us as our minds and the two work seamlessly together. Arguably this means that there is no interaction problem for Aristotle’s form of dualism.

What about intentionality? To recap, intentionality is the “aboutness” of thought; the way your thought about a cat is “about” that cat. But intentionality is also anything that is “directed towards” something else. Since intrinsic teleology implies that all causes are “directed towards” their effects, the intentionality of thought is not mysterious for Aristotle as it is for Cartesian dualists or materialists.

God and life after death

Plato and Aristotle invented two arguments for the existence of God: the cosmological (or First Cause) argument and the teleological (or design) argument. But the result was very different from Greek polytheism. For Aquinas, God is Existence Itself, and since truth and being are the same thing considered from different points of view, God is also Truth Itself. Since the final cause of our intellect is to know truth, the ultimate final cause of humanity is to know God – and this as a matter of rational argument, rather than just faith.

Given that we have “subsistent forms”, that God exists and our rationality is immaterial, is life after death possible? People still debate Aristotle’s opinion on this, but Aquinas clearly thinks it is possible, with a few caveats.

For Aquinas, since we are rational animals, we are supposed to have bodies and if we exist without them after death, it means we are in an incomplete state. Furthermore, since our minds are dependent on our physical senses for their input, after death our minds cannot receive any new information and we cannot change our opinions; we are locked in place, as it were.

Summing up

Science and philosophy have advanced somewhat in the last 2500 years [citation needed]. Aristotle did make scientific errors. So is the philosophy of Aristotle and Aquinas still a viable option today?

This is a very large question that cannot be addressed properly in one blog post. Aristotle is so different from how people think today that it takes some time to comprehend, much less critique. Nevertheless many aspects of Aristotelian thought have persisted, in particular his ethics; but even his essentialism is undergoing a revival. Here are a few reasons to take Aristotle’s philosophy seriously:

1. It explains the “unreasonable effectiveness of mathematics” or why mathematics is so effective in explaining the material world.

2. At the same time, it answers the riddle posed by Bertrand Russell, that the mathematical explanations of physics cannot be the whole story, as mathematics can only explain structure and structure presupposes something that has the structure.

3. Arguably it solves the mind-body problems that have plagued philosophy since Descartes, such as intentionality, mental causation and personal identity. This is huge; I know of no other philosophy that can make this claim.

4. It does all of the above without committing any of the following clangers: denying consciousness in animals, denying abstract thought, denying change, denying human knowledge, claiming that consciousness is an illusion or denying science. Again, a large percentage of philosophy does at least one of these things.

Here’s the thing: The way we think about science, matter, mind, God, morality, nature – almost every topic of importance – can ultimately be traced back to Descartes and his decision to dump Aristotle. You are a Cartesian materialist or a Cartesian dualist; a Cartesian Christian, Cartesian atheist or Cartesian agnostic. So if Descartes was wrong when he dumped Aristotle, that means that everyone is wrong, wrong about everything, because they build on faulty foundations.

If that’s so, we are in an ideas cage with iron bars, in an ideas prison, stumbling blindfolded through an ideas fog. We need a new Socrates to let us out.

Further reading

Mathematical Platonism by Massimo Pigliucci. “If one ‘goes Platonic’ with math, one has to face several important philosophical consequences, perhaps the major one being that the notion of physicalism goes out the window.”

Aristotle’s Revenge: Software Everywhere by James Ross. “Adequately replacing the deformed 17th century picture of nature and mind amounts to Aristotle’s revenge: for to explain the success of science, we have to postulate dynamic, inherent explanatory structures everywhere in nature [forms], the equivalent of “software everywhere”… Thus, the stones the builders of the 17th century discarded will become the cornerstones of the new foundations for science.”

David Oderberg on intentionality and final causes. “Proponents of physical intentionality argue that the classic hallmarks of intentionality highlighted by Brentano are also found in purely physical powers … I show that they all point to one overarching phenomenon of which both the mental and the physical are kinds, namely finality. This is the finality of ‘final causes’, the long-discarded idea of universal action for an end to which recent proponents of physical intentionality are in fact pointing whether or not they realise it.”

Virtue Ethics at the Internet Encyclopaedia Of Philosophy.

Read Plato for yourself. He is surprisingly readable. Start with Meno perhaps.

Read Aristotle for yourself. He is not surprisingly readable.

Still there? Read Aquinas for yourself.

Objective reality doesn’t exist

When Descartes rebooted philosophy 400 years ago, he got rid of Aristotelian metaphysics, removing what he saw as superfluous. This started a drive towards empiricism, with each philosophy doubting more than the one before. It was inevitable that someone would eventually doubt objective reality altogether. Thus in the 18th century came George Berkeley and his concept of idealism.

Go outside now and look at a tree. Kick it if you want. That tree is objectively real – or is it? Strictly speaking, you don’t know that. All you know is that your mind is giving you the experience of kicking a tree. That doesn’t necessarily mean that the tree is real, that you understand what the tree is, that you perceive it correctly. To check, you must go outside your mind for a Gods-eye view. Good luck with that.

Berkeley’s solution to this is radical – since you can’t know empirically that objective reality exists, it doesn’t exist. Simple.

Berkeley said that “to be is to be perceived”. In other words, that tree only exists because there is a mind perceiving it. So why don’t  trees and rocks and deserts disappear when they’re by themselves? Because they never are by themselves. A mind is always perceiving them; the mind of God.

So what we experience as objective  reality is actually subjective-in-the-mind-of-God reality. But God is permanent and unchanging so this is enough.

The way Berkeley’s idealism talks about physical reality being observer-dependent reminds one of quantum physics. Berkeley also argued against the science of his day, saying that absolute time and space cannot exist, but that an object can only have motion by comparison to another – reminding one of Einstein’s relativity. Thus, if your only criterion for old philosophy is how it echoed future science, Berkeley wins – hands down.

On the other hand, Berkeley thinks that matter doesn’t exist, that rocks are made of ideas, that mathematics is incoherent and that there is no such thing as abstract thought.

Here’s a quote from the man himself. Marvel at the level of confidence/hubris on display:

It is plain that the very notion of what is called Matter or corporeal substance involves a contradiction in it. … Insomuch that I should not think it necessary to spend more time in exposing its absurdity. But, because the tenet of the existence of Matter seems to have taken so deep a root in the minds of philosophers, and draws after it so many ill consequences, I choose rather to be thought prolix and tedious than omit anything that might conduce to the full discovery and extirpation of that prejudice.

Berkeley’s philosophy was bold, whatever else you might say about it.


After Berkeley came Hegel, who was far more influential.

According to Hegel, history consists of a Mind (Hegel called it Spirit) seeking to understand itself. Now this seems explicitly theistic, but Hegel hedged on whether he was talking about God or the human spirit or something else. It was possible to be a Hegelian idealist and an atheist simultaneously. C.S. Lewis somehow managed it before his conversion to Christianity.

Fortunately Hegel’s philosophy is simple and easy to understand. Take this quote for example:

The knowledge, which is at the start or immediately our object, can be nothing else than just that which is immediate knowledge, knowledge of the immediate, of what is. We have, in dealing with it, to proceed, too, in an immediate way, to accept what is given, not altering anything in it as it is presented before us, and keeping mere apprehension free from conceptual comprehension. (…) This bare fact of certainty, however, is really and admittedly the abstractest and the poorest kind of truth. It merely says regarding what it knows: it is; and its truth contains solely the being of the fact it knows. (…) In the same way the certainty qua relation, the certainty “of” something, is an immediate pure relation; consciousness is I – nothing more, a pure this; the individual consciousness knows a pure this, or knows what is individual.

Clear as mud, I say.

A few more quotes. I don’t understand Hegel, so this is from someone who does at The Electric Agora:

Hegel’s relation to logic is an odd one. He doesn’t think about logic; he doesn’t think logically; he thinks logic.


In Hegel’s epistemology, all objects of thought come to us in a two-fold manner: an inner “for-itself,” and an outer “for another.” So, when Hegel writes of an object “turning inward” — which sounds very strange — what he’s saying is that mind’s attempt to understand the object has gone “into” the object as affirmation of the object’s self-subsistence: “That thing exists and does so wholly in and for itself.” But this affirmation is actually a negation, because the idea of the thing in its self-subsistence is empty: “Okay, the thing exists, but as what?” Mind only begins to comprehend the thing when it begins accounting for the thing’s relationship to other things. “That object is a tree; it is not the bench standing next to it.” “That tree is living wood, not metal,” and so forth. But in this, the object has been negated again, but in a positive way: the individual tree has lost its unique importance, but its substance has been preserved and brought into the idea of “trees” — a universal manifesting itself in this particular.

Hegel’s idealism was a complete system of philosophy that dominated the 19th century. It was said to have answered all the questions of philosophy. It was hugely influential, until the 20th century drift to materialism started as a reaction against it.

Are you looking for an alternative to materialism? Does throwing out objective reality seem a bit much? Never fear; there is another option which will be discussed next time.

How do your thoughts cause your actions?

One of the central questions about the mind is that of mental causation – in other words, do your thoughts cause your actions, and if so, how? Common sense would tell you that your mind is in the driver’s seat – you make the decisions, your body obeys. But is this true and if it isn’t, what then?

Let’s look at how mental causation works if materialism is true. For this post, I’ll assume that materialism entails that your thoughts are encoded in some sort of brain language that is read by your consciousness. So every abstraction your mind produces – such as “dog” or “circle” etc, is stored using brain language and then translated for your consciousness.

A modest example: a tiger appears! You think “I need to run away from this tiger!” This thought is encoded in your brain language and your brain sends a signal to the rest of your body telling it to run away, and off you go. Thus there is a causative link between your brain and the rest of your body. So far so good.

Now, imagine that some crazed neuroscientist has swapped your brain language with its opposite, so that Yes means No and No means Yes. In this circumstance, the physical state of your brain language is unchanged, but your consciousness picks up an entirely different meaning. So instead of “I need to run away from the tiger”, your thought is “I must prepare my tax return” or “I’m zoopdegooging my croodifroods” – or just a complete blank. The logical content of such thoughts is very different, but the underlying physical state is the same. Since the physical state of your thoughts is the same, wouldn’t you run away from the tiger in the same way?

The same applies to anything else you do. You spend hours putting together a budget to decide if you can afford a new house. In the end, you decide to buy. You do this because and only because your brain language is in a certain state. If you had been thinking about football the entire time, or not consciously thinking about anything at all, but the brain language encoding was the same, you still would’ve bought the house.

It’s the physical state of your neurons rather than their logical content that counts. That means that the logical content of your thoughts has nothing to do – and therefore has no causative power over your actions. It’s not that your thoughts are wrong; it’s more that your thoughts are entirely unnecessary,  like a third elbow.

This has consequences. If the logical content of your thoughts is irrelevant, than your thought life is at best a passive observer, an illusion that makes you feel better about yourself but performs no useful function. Your experience of yourself as an active, thinking agent is false.

Also, it follows that rationality cannot possibly have evolved. Natural selection can act on the physical, but how could it act on the content of your thoughts if there is no causative link to your physical brain? For rationality to evolve, there must be a genuine causative link between behaviour and the logical content of your thoughts. So rationality didn’t evolve and must have come into existence some other way.

With natural selection unable to ensure quality, the materialist has two options – either rational thought is a miracle or freakish coincidence, or rational thought is an elaborate fantasy world and we must accept that it is an illusion.

Evolution and immateriality

What if materialism is not true? If the logical content of your thoughts is immaterial and somehow separate to your neurons, does that make it possible for rational thought to evolve? It depends.

If the logical content of your thoughts is a passive observer of your neurons or can bypass your neurons entirely, it will have no causative power and we are back where we started. If the logical content of your thoughts is separate to the structure of your mind and it’s the structure that does the work, there is nothing for the logical content to do and we are back where we started.

For natural selection to operate, the immaterial mind must have real power over the thinking process, rather than being a passive observer. It must be an intrinsic part of your brain as much as its physical aspect is; relying on the physical aspect of mind for its input data and using the physical aspect of mind to implement decisions it makes. Thus we have two-way mental causation – from the body to the mind and vice versa. Finally, the immaterial aspect of mind must be simple – it must be thought alone, rather than thought within a structure.

In conclusion, the concept of immateriality in mind has its advantages. It restores our faith in the theory of evolution by making the evolution of abstract thought possible, and restores our commonsense notion of being active, thinking agents.

To the Western mindset, talk of immateriality in mind seems strange and incomprehensible, but is this a reason to reject it? It is any stranger than what science tells us about quantum mechanics or black holes or many other topics? If science tells us that reality is strange and incomprehensible, on what basis can we insist that philosophy be normal?

It makes no sense to incorporate immateriality into an otherwise unchanged Western mindset; instead it is necessary to demolish the entire thing and rebuild from the ground up. I will discuss two non-materialist philosophies in future posts.

Is this an argument for God’s existence?

Some have used such considerations as an argument for God’s existence, but in my view this is a mistake. The existence of God is a separate issue and should be treated as such.

Further reading

Natural Selection and the Emergence of Mind, by Karl Popper. He argues that natural selection requires two-way causation between mind and body.

The Argument From Reason. Victor Reppert discusses and expands on C.S. Lewis’s critique of materialism and natural selection.

Mental Causation at the Stanford Encyclopaedia Of Philosophy.

The Core Of Mind And Cosmos, by Thomas Nagel. He argues that since mind cannot be physical, “it follows that biological evolution must be more than just a physical process, and the theory of evolution, if it is to explain the existence of conscious life, must become more than just a physical theory”.

Kripke, Ross And The Immaterial Aspect Of Thought (PDF), by Edward Feser. “The late James Ross formulated a simple and powerful argument for the immateriality of our intellectual operations. The gist of the argument is that: “Some thinking (judgment) is determinate in a way no physical process can be. Consequently, such thinking cannot be (wholly) as physical process.”