Tag Archives: Five Ways

Aquinas’ Fifth Way and Science

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While St. Thomas thought his First Way for proving the existence of God was “the most manifest” in his own day, it is the Fifth Way that is the most accessible to modern man.  Among the Five Ways, the Argument from Finality speaks most clearly modern man’s anti-metaphysical language.  In fact, one modern philosopher, Immanuel Kant, thought the Fifth Way oldest, clearest and the most accordant with the common reason of mankind.”  This is a powerful endorsement coming from the man who killed metaphysics and thought that there could be no objective proofs for God’s existence.  Given its accessibility therefore, it is instructive for us to examine it more closely.

The Argument from Finality is often mistakenly confused with its doppelganger, the Argument from Design.  St. Thomas’ proof is deductive and demonstrative while all the variations of the Intelligent Design Arguments are inductive and probabilistic.  The latter always leaves open the possibility, even if it is remote, that there is in fact no Intelligent Designer.  The Argument from Finality, while it too comes to the same conclusion, it proceeds in a logically sound manner leaving no doubt as to the existence of a Supreme Intelligence Who created and sustains all things in existence.

The two types of proofs are different in another important way.  Like the other Four Ways, St. Thomas’ proof is not really concerned with creation, but preservation.  It is concerned primarily with why things are the way they are right now.  In other words, it eliminates the possibility of deism that plagues all of the Intelligent Design-type arguments. 

The Argument

With that said, let us turn to St. Thomas’ rather brief argument directly.

The fifth way is taken from the governance of the world. We see that things which lack intelligence, such as natural bodies, act for an end, and this is evident from their acting always, or nearly always, in the same way, so as to obtain the best result. Hence it is plain that not fortuitously, but designedly, do they achieve their end.  Now whatever lacks intelligence cannot move towards an end, unless it be directed by some being endowed with knowledge and intelligence; as the arrow is shot to its mark by the archer. Therefore, some intelligent being exists by whom all natural things are directed to their end; and this being we call God.                   

  ST I, q.2 a.3

Proceeding from direct sense experience of the world, St. Thomas posits that since non-intelligent beings always (or at least when not impeded) act for an end, that is, act intelligently, there must be an intelligence “underwriting” their intelligent activity.

On the one hand this is common sense.  In fact, this is such a “given” that empirical science treats it as a first principle.  In order for science to proceed, it has to assume that the object of its study is intelligible.  Intelligibility requires intelligence.  Prediction requires predictability which requires a governing intelligence. 

But common sense, especially if it conflicts with a scientistic worldview, is not so common.  This makes philosophical inquiry necessary.  Framing the discussion within philosophical terms such as final causality makes the argument clearer.  Recall that a being can be explained with regard to its four causes.  The first two causes, the material cause, or what it is made out of, and the formal cause, or what makes the thing what it is, are intrinsic.  The other two, efficient and final causes, are extrinsic.  The efficient cause is the external cause that brings about the existence of a thing or a new way of existence.  This need not point to a First Cause (at least directly), but can refer to secondary causes.  The efficient cause of new oak tree is an acorn.  Looked at from the perspective of the acorn, we can say that the final cause of the acorn is to become an oak tree.  Given all the right conditions, it will develop into an oak tree and not anything else like a rosebush or a donkey.  This is always the case, so much so that we can say that the acorn acts towards this end and not another.

This connection between a thing acting as an efficient cause and fulfilling its own final cause is very important for modern science.  For modern science seeks to study efficient causality.  In developing predictive models for inert matter, it seeks to explain what causes changes in matter.  It does not concern itself so much with final causes, but they are always lurking in the background because of this inherent connection between the two extrinsic causes.  Even if it does not so much care about final causes, the modern scientist cannot act as if they don’t exist without simultaneously denying efficient causes.  It is like sawing off the branch you are sitting upon. 

Why There Must be a Final Cause

Because the acorn lacks intelligence, this inner directedness of the acorn to develop into an oak tree must have an extrinsic intelligent cause.  This becomes evident when we realize that Aquinas is talking, not about creation but preservation.  Why does the acorn, here and now, have as its end or telos, the oak tree?  And why must there be Intelligence for this to be the case?  In order for a final cause to be a true cause, then the effect must be in the cause.  To see how this works, we will draw an analogy with a human artifact, say a house.  The builder is the efficient cause of the house, but he is also what is called the exemplary cause.  It is his idea of what the house will look like that is the final cause.  That cause does not exist in the house, but in the mind of the builder.  So if we return to our acorn, we can ask where the final cause exists.  When we do, we realize that it exists as a divine idea.  Now we see why the final cause cannot exist without an intelligence.  It must first exist as an exemplar in order to be a true final cause.  It must exist not just at creation, but also in the here and now.   

Once this link between final causes and intelligence is made, we see why St. Thomas’ argument is true.  The fact that we observe anything that acts as an efficient cause is also acting upon its own final causality.  Because these things act towards ends, and not just any ends, but very specific ends, there must be an intelligence behind it.  “Therefore some intelligent being exists by whom all natural things are directed to their end; and this being we call God.”

Understanding what St. Thomas is really arguing for then becomes important because it differentiates it from other Intelligent Design arguments.  This demonstrative proof is protected from the “God in gaps” arguments that usually plague these types of arguments.  Sharing the same assumptions as modern science, it also makes it especially potent against those who reject God based on scientism.

Translating the Five Ways

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Having stood the test of time, St. Thomas Aquinas’ Five Ways remain a reliable means by which to prove the existence of God.  The problem, especially in an age steeped in scientistic thinking, is that most people are metaphysically illiterate and unable to really capture the genius behind them and see their great evidentiary power.  This calls for those who can understand the proofs to summarize them in such a manner that even the metaphysical novice can understand.  Better yet, in a sound-bite culture, it is invaluable to provide a single argument that combines all five into one.  Thankfully, there are Thomists in our own age who have done the legwork on this (Fr. Reginald Garrigou-Lagrange’s God His Existence and His Nature and Edward Feser, Five Proofs for God) but their work remains inaccessible to those unschooled in Scholastic Philosophy.  It is in this spirit, that this essay tries to translate St. Thomas’ work into a language that can be readily understood, and more important, presented to unbelievers.

The great 20th Century Thomist, Fr. Reginald Garrigou-Lagrange summarized the arguments like this:

“All these arguments can be summed up in a more general one, based on the principle of causality, which may be stated as follows: That which does not exist by itself, can exist only by another, which is self-existent. Now, experience shows that there are beings endowed with activity, life, and intelligence, which do not exist of and by themselves, since they are born and die. Therefore, they received their existence from another, who must be existence, life, and intelligence itself. If such were not the case, we should have to say that the greater comes from the less, the higher form of life from the lower, and that the plurality of beings comes from a primary being less perfect than all the others taken together.”

God: His Existence and His Nature Volume I

An Important Distinction

At the heart of each of the Five Ways is the distinction between what a thing is or its essence and that a thing is or its existence.  Once we grasp this distinction, the existence of God logically follows.  Everywhere we look we find things that have not always existed.  No visible being has as part of its nature, existence.  Each being requires that existence be given it by another being.  We call these existence-dependent beings, contingent beings.

One of the common mistakes we make in interpreting these arguments is to look at them as proving a First Cause in time.  But that is not what they do.  They set out to show a First Cause in existence.  Contingent beings, beings who do not have existence by nature, require existence be given them not just when they come into being, but in order to remain in being.  The fact that a thing exists at each moment would not allow for an infinite regress in causes.  But because this is not immediately obvious, we will discuss it briefly.

The chain of causes that we are describing is called an essentially subordinate series.  It is labeled as such because in order for the entire series to hold, the First Cause must continually exercise its causal activity.  Suppose we have a chain ABCD.  C can only cause D because it is being caused by B.  Likewise B causes C.  You could multiply the causes between B and A, but unless you get to a cause, which we are calling A, that is uncaused, then the chain of causation will never occur.  There must be a cause that does not itself require a cause in order for any link of the causal chain to connect.

Recall that this causal chain is not tracing back in time like an ancestral tree where a grandmother ceases to exercise causal power on her grandson, but is horizontal in holding a being in existence here and now.  St. Thomas uses the analogy of a man using his arm to push a stick that moves a rock.  If the man ceases to exercise his free will in moving his arm, then the stick ceases to move and the rock remains stationary. 

Once we eliminate the possibility of an infinite regress, we can see how the proof leads us to God.  If there must be an uncaused cause, a being who does not get existence from another source, then we can say this being’s essence includes existence.  We call this being the necessary being.  More accurately we would say that this Being because his essence is to exist is existence itself.  And we call this Being God or “I AM”.

The Five Ways and the Way

This obviously does not take us all the way to the Christian God as He has revealed Himself.  Reason could never get us there.  But it does, in a certain sense, lead us up to the time of Moses.  God revealed Himself to Moses as Being Itself, “I AM WHO AM” because it was the foundation upon which He was to reveal Himself not just as Being Itself, but Being Who is here for you right now.  Once we grasp that it is God Who doesn’t just create us and leave us to our own devices, but instead holds us in existence at each moment, the Christian message becomes more accessible.  If God is holding us in existence then He must will to do so.  He wills not in some disaffected way, but because He sees our existence as something good.  And not just “our” but mine and yours individually.  He wills it because He loves the good that we are.  We need only open ourselves to the fullness of that love so that we don’t merely exist as creatures but are crowned as sons. 

By adding the Christian conclusions to our philosophical findings, we come to realize why St. Thomas should never be seen as some dry intellectual philosopher.  He saw all of his work as leading us back to God, including his proofs for his existence.  We too may grasp this when we set to succinctly give his reasons for believing, not just to win arguments, but to win souls.  The Five Ways ultimately lead us to the Way Himself. 

Arguing for God’s Existence Through the Degrees of Being

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According to the First Vatican Council, it is an article of Faith that the existence of God can be proven using reason alone.  This declaration shows just how much faith the Church has in reason and philosophy.  It is an endorsement for the metaphysical endowment that God has given to man in the form of his own intellect.  The timing of the Vatican Council’s declaration is not accidental; reading the signs of the times almost 150 years ago, the Council Fathers saw that faith in reason was in decline and so the Holy Spirit thought it necessary to remind us of our metaphysical prowess.  Their message remains a clarion call for us today.

Among the many proofs for the existence of God, the Church has given a special pride of place to the Five Ways of St. Thomas.  These proofs ably combine metaphysical thinking with common experience to lead us to back to God under five different attributes: the Unmoved Mover, the Uncaused Cause, the Necessary Being, the Most Perfect Being and the Orderly Governor of Creation.  This does not, mind you, replace what God has revealed, but instead acts like a preamble to faith or a preliminary motive of credibility that paves the way for the invasion of grace and true Faith.  These proofs have proven to be irrefutable.  Those who have tried have only shown themselves unable to understand them.  It is therefore vital that we be able to present these proofs in an intelligible manner.  In the past we have explained the First Way so that in this essay we will present what is the most metaphysical of the Five Ways, the Fourth Way, often called the Argument from Degrees of Being.

Before getting to the actual proof, it will be helpful to review the metaphysical principles that St. Thomas employs because the modern mind habitually assumes that all value judgments are subjective.  But objective reality is otherwise.  But in order to grasp this, we need to introduce the medieval concept of the Chain of Being.

The Chain of Being

In an egalitarian age that is unable to decipher between the value of man and beast, the Chain of Being might strike us as odd.  It posits that the world is not just a blob of different stuff or a random collection of atoms, but instead an ordered hierarchy of beings.  The ordering is not based upon subjective preferences, but upon objective standards.  A man’s best friend really does have more value than Man’s Best Friend; John is objectively more valuable than Fido. 

Merely saying so does not make it so however.  Instead we must look at why John is more valuable than Fido.  We say that one creature is greater than another when it has more perfections, that is more being.  A geranium has life and can grow and thus has more perfections than a Plymouth Rock.  Fido has life and the capacity to grow, but also the power of locomotion and sense knowledge.  John too has vegetative powers and sensitive powers of Fido, but also the power to reason.  John is more valuable than Fido because he has more perfections.  And because he has more perfections, he has more being and occupies a higher place in the Chain of Being.  We can say that John is objectively more valuable than Fido accusations of speciesism not withstanding.

It is better to be than not to be.  Put another way, a thing must exist before it can be good so that whatever has goodness must have being.  The reverse is also true: everything that has being also has some goodness.  This is the case because being and goodness are convertible meaning that we can examine being under the aspect of goodness. To be is good and to be more is to better.  Good is related to the perfection of being.

Being is not within a category, but instead transcends all categories because it contains all categories.  The same applies to goodness in that it transcends all categories because it applies to all of them.  This is why we refer to goodness, along with truth and beauty as transcendentals.  Truth is a transcendental because all being is in a sense knowable.  The more being a thing has, the more knowable it is (and the hard it is to truly know).  In that sense we can also say that a plant is more true than a rock.  Likewise with beauty which, in a certain sense, combines goodness and truth so that the objectively beautiful exhibits integrity, harmony and clarity.  To avoid repeating what has been said before, I point the reader to this link on beauty.

Aquinas’ Fourth Way

With our feet planted on this metaphysical foundation, we can now evaluate St. Thomas’ argument.

The fourth way is taken from the gradation to be found in things. Among beings there are some more and some less good, true, noble and the like. But “more” and “less” are predicated of different things, according as they resemble in their different ways something which is the maximum, as a thing is said to be hotter according as it more nearly resembles that which is hottest; so that there is something which is truest, something best, something noblest and, consequently, something which is uttermost being; for those things that are greatest in truth are greatest in being, as it is written in Metaph. ii. Now the maximum in any genus is the cause of all in that genus; as fire, which is the maximum heat, is the cause of all hot things. Therefore there must also be something which is to all beings the cause of their being, goodness, and every other perfection; and this we call God.

ST I, q.2, art. 3

St. Thomas begins by referring to the aforementioned Chain of Being.  What he then goes on to do is say that if we predicate a transcendental property to any being, then there must be “something which is truest, something best, something noblest and, consequently, something which is uttermost being.”  This might not be intuitive based on our foundation so we will spell it out more explicitly. 

Although creatures have various degrees of being, none of them are the cause of their own being.  Each creature is limited in their being by their nature or their essence and thus they must receive their existence from another (this is the First Way).  This cause of being cannot itself require a cause but instead must have maximal being, that is, it must be of their essence to exist.  This Being, we call God Who calls Himself “I AM”.

Meeting an Objection

It is worth looking at an objection because it helps to clarify the argument and illuminate St. Thomas’s genius.  It would be a misreading of the argument to assume that St. Thomas is saying that all things that exist in degrees must have a maximum.  He is partly to blame for this because of the example he used with respect to fire and heat.  Heat need not have an absolute maximum.  Treating it as simply an example of a closed system in which a fire is the source of all heat, makes the example more intelligible.  Many people, including theists, make this mistake.  But none make it with as much flair as Richard Dawkins did in his book The God Delusion when he said that “You might as well say, people vary in smelliness but we can make the comparison only by reference to a perfect maximum of conceivable smelliness.  Therefore, there must exist a pre-eminently peerless stinker.”

Dawkins’ cleverness stops at his example.  Unable to see anything without his scientistic glasses, he can only see the flaw in St. Thomas’ example and is unable to grasp the underlying logic.  A bad example does not invalidate the principle.  Dawkins and his kind do not grasp that the argument is not about beings in particular, but being itself.  St. Thomas is focused only on the transcendentals—” so that there is something which is truest, something best, something noblest and, consequently, something which is uttermost being; for those things that are greatest in truth are greatest in being”—and not on particular created things.  Those things that share or participate in a limited way of being, goodness, truth and beauty must be caused by a Being that is essentially and maximally good, true and beautiful.

The Unmovable Straw Man

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Richard Dawkins opens his chapter on surveying arguments for God’s existence by quoting from Thomas Jefferson that “a professorship of theology should have no place in our institution.”  Instead of demanding proof for this statement, Dawkins turns his gaze towards the proofs of another Thomas, St. Thomas Aquinas.  With amazing brevity he is able to debunk the first three of Aquinas’ five ways in a mere two paragraphs.  Three quarters of a millennium is swept aside by a Professor of Public Understanding in Science at Oxford in a mere two paragraphs relegating one of the greatest philosopher’s arguments to the dustbin of history.  Unfortunately, upon even a cursory examination the Professor’s rebuttal falls rather flat.  In fact, for those who have actually read and studied Aquinas’ five ways you get the impression that Dawkins is talking about a completely different argument.

Dawkins might advocate removing theology from the standard course of study, but he has also thrown the philosophical baby out with the theological bathwater.  He and his “New Atheist” friends may be competent scientists, but they are terrible philosophers.  Revealing hubris more than truth, they are particularly adept at knocking down straw men. Rather than putting forth the intellectual effort to grapple with the real argument they dismiss it with a healthy dose of acerbic wit.  So despite the fact that they are a loud gong signifying nothing, they make enough noise that they get the attention of many people who thoughtlessly regurgitate their arguments.

Dawkins and the First Way

Here is how Dawkins describes Aquinas’ first way:

The Unmoved Mover.  Nothing moves without a prior mover.  This leads us to a regress, from which the only escape is God.  Something had to make the first move, and that something we call God.

Candidly, if this did accurately describe Aquinas’ proof, then he would be warranted in his criticism when he says, “They make the entirely unwarranted assumption that God Himself is immune to the regress. Even if we alow the dubious luxury of arbitrarily conjuring up a terminator to an infinite regress and giving it a name, simply because we need one, there absolutely no reason to endow that terminator with any of the properties normally ascribed to God: omnipotence, omniscience, goodness…”

Of course this is not at all what Aquinas was arguing in what he called the “more manifest way of the argument from motion” (ST I, q.2 art.3).  When Aquinas speaks of “motion” or “movement” he is not talking about physical bodies moving from one place to another specifically.  Dawkins is not alone in his linking this argument with what he calls a “big bang singularity” or anything like a cue ball hitting one ball that then knocks another ball into the pocket.  Rather than locomotion (i.e. motion though space), Aquinas is concerned with motion in the broader sense of change.  Change for Aquinas is the actualizing of some potential.  This is why this particular argument is the most obvious for Aquinas—we see change everywhere we look.  All change requires a changer, that is some actualizer to a given things potential.  Lukewarm water is potentially cold, but in order to become cold, it must come into contact with something that is actually cold.  This is nothing other than the principle of causality, a principle that a scientist like Dawkins must readily accept.

“All change requires a changer” sounds like just a rewording of what Dawkins said, except by examining change more broadly Aquinas is concerned not of a linear change like tracing the Big Bang to a Big Banger (that would be just locomotion) but having a vertical understanding change in the here and now.  An example might help to understand this.

The keyboard on this computer has the potential to put the letter R in a document.  But in order for that potential to be actualized, it must have someone type it.  But for someone to type it, it must be open and on a desk.  In order for the desk to hold it, it must be sitting on a floor.  In order for the floor to hold the desk holding the computer it must rest on joists that rest on a foundation that rest on the ground.  The earth is held in place by the sun which in turn is held in place by the other heavenly bodies and so forth.  Each link in the chain reveals another actual being that was only potential until something else actualized it.

Notice that the regress then is not backward in time, but here and now.  Notice also that no infinite number of desks, for example, could support the computer.  Each desk cannot derive its power to support the computer on its own.  It must borrow that power from something else.  In short, even an infinite number of desks must sit upon something unmovable, or an “unmoved mover.”  No number of desks can support themselves.  So, rather than making the “entirely unwarranted assumption that God Himself is immune to this regress” Aquinas shows the necessity of some being that has no potential and is pure activity.  Dawkins has failed to even address the argument but simply labels it “an unwarranted assumption.”  It is not an assumption but something that Aquinas has proven.  Perhaps he is mistaken, but you must deal with the argument as it is.  You have to disprove the principle of sufficient reason, which would also throw science as a discipline out with it.  Dawkins and many of those who repeat what he says instead takes the intellectual high road and mocks what is a very serious challenge to his worldview.  Rather than relying on reason as he purports to do, Dawkins instead prefers faith in his unprovable assumption that God does not exist.

But Must We Call It God?

Reading between the lines of what Dawkins says it might be that he rejects calling this necessary being God.  He mentions that “there is no reason to endow the terminator with any of the properties normally ascribed to God.”  This again reveals his unwillingness to actually engage the argument and instead prefers to play silly games like pitting omniscience and omnipotence against each other.

Certainly there are limits to what reason can tell us about God.  To fully reason to God would make us God.  For those invited to divine participation they must rely on Divine Revelation to know that He listens to prayers and forgives sins (two that Dawkins mentions).  But once reason tells us that He exists and that He is omnipotent, omniscient, and omni-benevolent then faith can tell us the rest.

Rather than having “no reason to endow” God with these attributes, we have good reason from what has already been said.  Because He is the source of all change or motion, He must be all-powerful.  Since the principle of sufficient reason tells us that the effect must be in the cause and that the thing known must be in the knower, the nature or essence of all things must be in the cause of them.  Therefore God is omniscient.  Finally, because He lacks nothing (i.e. having no potential) and the actualizer of all things He must be omnibenevolent.

Aquinas closes his first way with the statement, “therefore it is necessary to arrive at a first mover, put in motion by no other; and this everyone understands to be God”( ST I, q.2, art. 3).  Everyone?  Perhaps Aquinas was wrong.  More likely though is that there are many who refuse to acknowledge God’s existence by doing the intellectual leg work to confront challenges to their worldview.