Why Philosophical Materialism Undermines Human Reason
I recently had the displeasure of running across a post on Rod Dreher’s blog where Dreher had made reference to an internet discussion hosted by Stanley Fish of Terry Eagleton’s new book on the silliness of contemporary atheism. Fish had in this discussion given his own public unmasking of the epistemological naivete of philosophical materialism. A bunch of people who seem to crosspost one another so as to gang up against theists in comment boxes had put together a string of comments attempting to dismiss Eagleton and Fish. Their comments were, as is usually the case with these people, embarrassingly ignorant and shallow.
I decided to enter into the fray, pointing out to these sadly ignorant atheists that the implicit assumption of philosophical materialism or naturalism would, if its implications were truly understood, lead to skepticism of all forms of knowledge. Of course, many atheists tend to presume that science undermines Christian faith. They view themselves as the upholders of reason and science against the obfuscations of Christian belief. Little do they realize that the scientific materialism that they have embraced, in whatever particular form it may take with them, undermines the valid achievements of human reason altogether, including the achievements of science. Atheism, in other words, and not religious faith, undermines science.
Needless to say, my comment was met by blank incomprehension and by evasion. It tended to annoy these shallow atheists, mostly trained in engineering methods but not in the exercise of human reason as applied to ultimate issues. Unfazed by their ignorant and uncomprehending dismissals, I have decided to demonstrate here, in a series of posts, why it is that the embrace of philosophical or scientific materialism must lead ultimately to a skepticism toward all knowledge. I shall demonstrate, in effect, that postmodern relativism is the inevitable outcome of believing that the only things in the world that are real are those entities that are in principle capable of being discovered by modern scientific investigation.
I’ll take as my starting point for this demonstration the philosophy of the great British Empiricists Bishop Berkeley and David Hume. Berkeley and Hume, in the 18th century, were the first to see the problem for human knowledge that comes with assuming that matter in its various forms is the only reality.
Berkeley saw the problem and was thereby led to reject the dogma of modern materialism that physical nature is composed entirely of material substances whose only reality is extension in space (res extensa) or geometrical shape. This doctrine had been upheld by Descartes, Bacon, Hobbes, Galileo, Newton, and Locke. It assumes that our perceptions are caused by that which is in fact imperceptible. Berkeley realized that this dogma must lead to a denial of the objective validity of human perception and knowledge. He argued, in order to counteract this materialist presupposition, that there is in fact nothing in nature that goes unperceived. All of physical nature is perceived: by humans, angels, and the mind of God. The imperceptible, in his view, is not the cause of the perceptible. Rather, all things are caused by the infinite perceiver: God himself (who does not go unperceived to himself).
Berkeley’s understanding of perception has generally been castigated as a form of subjective idealism. He has been accused of denying the objectivity of the world external to human perception. This is the standard reading of him. In fact, he did no such thing. He argued that the world that we perceive is the world as it is in itself. It is real, but it has its basis in the perceiving (read: knowing) mind of God. He argued that one must reject the reality of purely material substances if one is to uphold the objective validity of human perception. Louis Dupre has rightly said of Berkeley’s position that it is, like Cardinal John Henry Newman’s 19th century epistemology, a form of spiritual empiricism, not of subjective idealism. Berkeley, unlike the subjective idealists and scientific materialists, upholds a doctrine of epistemological realism. He holds that we really perceive the objective world and that we can really come to know it.
Be that as it may, it is Hume who is the key figure of modern thought because he shows better than any other modern philosopher outside of Kant (on whom Hume was the decisive influence) the despair and skepticism to which scientific materialism must lead if its implications are rightly understood. Hume saw the validity of Berkeley’s insight that if material substances are the cause of all that we perceive then our perceptions cannot possibly put us in touch with objective nature. Hume realized this, but unlike Berkeley he did not come to reject the doctrine that material substances are the only principles of physical nature. He accepted the materialist doctrine and took it to its logical conclusion. He chose skepticism over Berkeley’s intuitive realism.
Hume understood that philosophical materialism implies a doctrine of perception that sees all human experience as rooted entirely in material processes (a doctrine that Alfred North Whitehead would later label “sensationism”). All human experience, if material substances are the sole reality of physical nature, must be caused entirely by material sensory impressions striking our sensory organs. Hume realized, like Berkeley before him, that if the striking and beating of material processes on sensory organs is the objective correlate of experience, then our perceptions must be internally generated ideas in the mind and not gateways to the objective world. How could it be otherwise? The colors, sounds, tastes, smells, etc., that we experience are not what is real in nature. What is real in nature is the bumping and striking of material substances whose whole reality can be encapsulated in mathematical formulas. The experience of the redness of an apple, for instance, is an illusion of our inner ideas. What is objectively real in the experience of an apple is its material or sensory basis: the light frequencies that extend from the material substance of the apple striking, in consecutive fashion, the human eye and optic nerve. These give us sensory impressions in our brain that our mind’s eye contemplates and turns into perceptual realities that bear nothing in common with the material sense impressions in themselves. The infinite array of human perceptions is qualititatively different from these purely material sensations. Yet, only the sensations are objectively, publicly real. The sensations are “primary” or real qualities. The perceptions are “secondary” or imaginary qualities.
This led to quite a dilemma for Hume. Refusing to reject materialist substantialism, he had to assume the existence of two separate worlds: one is the real world outside of perception that is mathematically describable, and the other world is the world that we perceive, a world of fragrance, and color, and beauty — a world that is felt in emotion and expressed in art, and religion, and poetry, but that does not correspond to the world-in-itself. The world of human culture is merely one of expressed ideas of impressions. It does not express the world as it objectively exists in time and space. Indeed, Hume was quite despondent over this situation. When he played the role of philosopher he found himself isolated, much as would later happen with Nietzsche:
I am first affrighted and confounded with that forlorn solitude, in which I am plac’d in my philosophy, and fancy myself some strange uncouth monster, who not being able to mingle and unite in society, has been expell’d all human comerce, and left utterly abandonded and desolate…I call upon others to join me, in order to make a company apart; but no one will hearken to me. Every one keeps at a distance, and dreads that storm, which beats upon me from every side. (A Treatise of Human Nature, Oxford, 1960, 264, 269)
Many “concretely-minded” Anglo-Americans in our day view such expressions of dread with a wink and a nod, seeing Hume as an exaggarator, or as a bit cracked. But Hume is a greater “agent of truth” than they. He is more perceptive and honest. He has considered the full consequences of the philosophical materialism that he has adopted. He realizes that if matter is the only ultimate reality then the world of common human experience, the world of human discourse and cultural achievement (including science), is nothing but a subjective illusion. And this should indeed shake one to the core of one’s being, if one truly understands or is truly honest.
Kant, originally a physicist who was himself “shaken from his dogmatic slumbers” by Hume, realized that science required a defense of its universal validity in the face of the dilemma of materialism that Hume had exposed. How did Kant “rescue” science? That will be the topic of my next post.

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