Philosophically knowing nothing but the truth about God

Dr. Edward Feser’s Five Proofs of the Existence of God’s lively approach demonstrates that natural theology’s funeral directors, despite all their bluster, will be buried first: Feser takes a shovel to them.

Saint Thomas Aquinas, in one of his commentaries on Aristotle, remarked that “the study of philosophy has as its purpose not to know what people have thought, but rather the truth about the way things are”.i With his new book, Five Proofs of the Existence of God, Edward Feser continues his unfashionable but rigorous quest for the truth about the way things are in relation to God.

In keeping with his usual practice, Feser writes in an entertaining and accessible style, but this time around he uses it to defend his own philosophical formulations (five formal proofs, each with clearly numbered steps), rather than to defend the best academic interpretations of others (Aristotle and Aquinas), as he did in previous books.

Feser defends the traditional view that we can know the fact of God’s existence. In the very process of arriving at this knowledge, we must necessarily arrive also at an understanding of many of God’s divine attributes. Hence it is a hoary cliché to set the “God of the Bible” at odds with the “God of the philosophers,” as if philosophers have nothing to offer us to assist us in our interpretation of Scripture.

Although inspired by previous work (done by Aristotle, Plotinus, Augustine, Aquinas, and Leibniz), Feser offers five of his own arguments. Informal, dialectical argumentation is first offered preceding each of his five proofs. Then, for each proof, he gives a formal argument in numbered steps, which clearly exhibits the rigorously logical sequence of thought. Finally, he replies to whatever objections he can anticipate contemporary thought would make. I found these latter discussions particularly enjoyable, especially whenever they engaged with objections inspired by the strongest modern scientific theories, like relativity or quantum mechanics.

The first five chapters of Five Proofs of the Existence of God set forth Feser’s own variations on five arguments found in the grand tradition of natural theology. Natural theology is the philosophical discipline that traditionally offers indispensable assistance to biblical theology, by supplying it with natural reason’s best arguments and distinctions about the nature of God. Whether all readers are convinced by Feser’s proofs or not, Feser’s lively approach in this book nonetheless demonstrates at least this much: despite all their bluster, natural theology’s funeral directors will inevitably be buried first. Feser takes a shovel to them.

His logical tenacity is exhibited well beyond the five proofs of the first five chapters, as the book’s sixth chapter proceeds both to reiterate and expand upon the arguments of the first five chapters’ reasoning about God’s own attributes. Feser’s persistence on this point pays off as he clearly exhibits how we may attain very good rational knowledge about the divine attributes. Moreover, this detailed knowledge, attainable by natural reason, is shown to be in perfect harmony with the attributes of God described for us by divine revelation, such as his omnipotence and perfect benevolence.

Finally, the seventh chapter, as with the previous chapters, patiently replies to the many possible objections to natural theology. Devastating replies from earlier chapters are repeated here and also added to, as Feser organizes his defense into a more comprehensive dialectical toolkit. For many people, this will be their favorite part of the book. After all, it provides a handy compendium of enlightening and charitable replies to whatever ridiculous or obnoxious things they themselves may hear people say. Feser takes the supposedly most devastating objections to natural theology and entertainingly exposes them as surprisingly flimsy.

I always enjoy Feser’s bracing logical rigor, as well as his scrupulously fair way of assessing competing lines of argumentation. He is refreshingly candid, though, about letting you know where he stands in any controversy. His straightforward approach fits well with my favorite parts of this book, which are the formal arguments themselves. The numbered steps invite further exploration via logical analysis, and I found great pleasure in being able to translate Feser’s arguments into symbolic logic as I studied them closely.

In my judgment, this book is (as I have already remarked elsewhere) “a significant, original philosophical contribution to the scholarly discipline of natural theology”.ii My own analytical assessment is that the formal arguments are all logically valid, and Feser’s informal dialectical arguments make a strong case for the truth of all his premises.

The only weakness I detect is in his third argument, which I think commits a petitio principii similar to Anselm’s ontological argument, as a logical analysis of the formal argument clarifies that Feser’s “Augustinian proof” presupposes that the mode of existence of all abstract ideas is such that only a divine intellect could be their origin.iii

Nonetheless, if combined with argumentation from Aquinas’ Third Way, I think that this flaw in Feser’s “Augustinian proof” can be eliminated, since the Third Way could permit us to derive the relative degrees of actual necessity in abstract ideas in a non-circular way, i.e., as being abstracted from the actual existence of the physical universe. Without beginning from an actual feature of the universe known to the senses, Feser’s third proof (unlike his other four proofs) begins in “mid-air” in a way that is structurally similar to Anselm’s ontological argument.iv

Still, Feser’s proof is skillfully constructed such that it could be harmonized with a longer, more Thomistic argument that could plunder Aquinas’ Third Way for some required premises. Perhaps he refrained from doing this because of his professed desire for his book’s five proofs to be considered by the reader separately from Aquinas’ Five Ways. (Interestingly, careful readers will notice that later in the book Feser often implies that he is aware of this difference between his third proof and his other proofs, since he lumps the other four proofs together when speaking of their common features.)

As I have already indicated, the truly fresh approach of Feser’s book lies in its laser-like focus on truth, rather than on fine-tuning contested interpretations about who meant what whenever they wrote. In the book’s very first sentence, Feser unmistakably signals his desire to stick to investigating the truth, and nothing but the truth, by stating: “This is not a book about Saint Thomas Aquinas’ Five Ways.”

The book thus deliberately chooses not to focus on how critics have misread and misunderstood Aquinas’ brief outlines of how the mind can understand God. Feser has already dealt at length with the colossal failures of academic criticisms of Aquinas in his previous books, such as Aquinas and The Last Superstition. Instead, he clears the decks here, by turning from the tedium of contesting the endlessly bad textual interpretations of Aquinas, to speaking instead in his own voice and asking his readers to impute all praise and blame for these proofs to Feser himself.

It’s a boldly productive move, and more significant than most people realize. Because while (for argumentative purposes) Feser may deny it, the five proofs here are nonetheless (in my opinion) fresh, contemporary ways of defending the core insights that generated the famously sketchy outlines found in Aquinas’ Five Ways.

However, I think Feser is right that, to vindicate Aquinas’ natural theology, we need to move the discussion forward in more productive ways. We need to stick more to debating the truth of any given proof, and not so much to wrangling over what someone meant when he said something, if he is not here to answer in his own name. Because Feser’s here, and ready to argue back.

In other words, today we need not so much to study what Aquinas thought, but rather the truth about being. And if they end up converging? Well, that’s great, but first let’s emulate Feser’s dogged concern in this book with simply seeking the truth and expressing arguments clearly.

Five Proofs of the Existence of God
by Edward Feser
Ignatius Press, 2017
Paperback, 336 pages


iSt. Thomas Aquinas: “studium philosophiae non est ad hoc quod sciatur quid homines senserint, sed qualiter se habeat veritas rerum”, In libros Aristotelis De caelo et mundo expositio I.22.228. (The emphasis in the translation is mine.)

iiiCf. Paul Weingartner, God’s Existence. Can It Be Proven? A Logical Commentary on the Five Ways of Thomas Aquinas (Frankfurt: Ontos Verlag, 2010), 21–27.


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About Christopher S. Morrissey 34 Articles
Christopher S. Morrissey teaches Greek and Latin on the Faculty of Philosophy at the Seminary of Christ the King located at Westminster Abbey in Mission, BC. He also lectures in logic and philosophy at Trinity Western University. He studied Ancient Greek and Latin at the University of British Columbia and has taught classical mythology, history, and ancient languages at Simon Fraser University, where he wrote his Ph.D. dissertation on René Girard. He is a managing editor of The American Journal of Semiotics. His poetry book, Hesiod: Theogony / Works and Days, is published by Talonbooks.


  1. The human intellect is creative since it is not constrained by formula. Drawn from Bergson’s The Creative Mind in which he demolished the Positivists intellectual determinism. Morrissey is thereby correct in defending Feser opening with Aquinas’ comment on Aristotle’s De Caelo “The study of philosophy has as its purpose not to know what people have thought, but rather the truth about the way things are”. That justifies intellectual freedom to offer complimentary argument of the existence of God. As one perceives it. Based on Morrissey’s limited excerpts/observations on Feser’s book Natural Philosophy gives us wide leeway. Anselm premise “Nothing greater can be conceived” though conceptual nonetheless exhibits a propensity given by God to the intellect to think beyond “the box”. It is similar to Bonaventure’s Breviloquium in which he perceives justification in a Platonic propensity to the perfect in the perception of physical beauty. My own experience has been similar in a perception of good. Aquinas says we perceive good in things that are good. Good is convertible with being (ST 1a2ae 18, 3). Ergo the eye of the intellect by its nature may pierce beyond the veil of Nature.

  2. Proponents of atheism affirm that God and gods are fallacies generated by absence of scientific logic and procedures. I doubt that God’s existence can ever be ‘proved’ by science, namely by the application of observation and measurement to physical and speculative phenomena. Nevertheless, to be an atheist, one perforce must defend a negative — God does not exist – and must defend it by observation and measurement. In order to do so, one must define albeit negatively, what it is that does not exist.
    While I have yet to read the book, I will do so, hoping to find within it a definition of God that atheists can use to define what they do not believe and do not support and why. As it is they can dismiss God as a fictitious, bearded old man floating among clouds, or as an overriding impossible single concept that fails to fit infinitely larger and infinitely smaller phenomena.
    Despite the positive efforts of the philosophers and the negative approach of the scientists, for the body of all humanity God is with us (Jung), invited or not. But for both Christian and non-Christian believers, God is immeasurable, unobservable, and generates an emotional leap in the dark and scientifically indescribable or invalid communications. We know God by indirect, unscientific, but nevertheless philosophically valid, metaphor, allegory, and mystery. The unending, infinite road of the atheist leads to incomplete knowledge and death in ignorance. The belief-limited road of the Christian and non-atheist leads to life forever surrounded by the mysteriously measurable and observable. Free will and mutual existence leaves each of us to walk alone or together on either road and accept ultimate responsibility.

    • “…they (atheists) can dismiss God as a fictitious, bearded old man floating among clouds…”

      We Christians dismiss that too. God isn’t a creature–not even a creature with Marvel-esque Disney cartoon super powers. Hah ha on the atheists.

  3. How do scholars explain the fact that no one (not Jesus, not His apostles, not anyone) in the New Testament is shown teaching any Greco-Roman type philosophical proof of God, yet the church flourished notwithstanding in that period?

    St. Paul in Romans 10:17 seems to describe the way that everyone in the New Testament taught and preached: “But not all of them welcomed the good news. For Isaiah says, Lord, who has believed our message?’ Consequently, faith comes by hearing, and hearing by the word of Christ.”

    In the Book of Acts, we see Peter and Paul simply tell the story of salvation to crowds or individuals. Some accept it, some do not. No one attempts a philosophical proof of anything.

    When Pilate said to Jesus, “What is truth?” Jesus could have provided Pilate with a philosophical answer that might have satisfied him, but Jesus didn’t do that.

    When St. Paul spoke with some Greek philosophers in Athens, Paul could have engaged them with Greco-Roman philosophical argumentation, but is never depicted as doing so.

    So, how do scholars explain the absence, in the New Testament, of Christian teachers and preachers presenting philosophical proofs as a means of winning converts or building up the faithful?

    I’m just asking! I love philosophical proofs as much as anyone!

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