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Why have materialist views been so dominant? Part of the answer is that it is far from clear that dualist views, at least those that go much beyond the bare denial of materialism, are in any better shape. But it must be insisted that the inadequacies of dualism do not in themselves constitute a strong case for materialism: arguments by elimination are always dubious in philosophy, and never more so than here, where the central phenomenon in question (that is, consciousness) is arguably something of which we still have little if any real understanding. Instead, materialism seems to be one of those unfortunate intellectual bandwagons to which philosophy, along with many other disciplines, is so susceptible — on a par with logical behaviorism, phenomenalism, the insistence that all philosophical issues pertain to language, and so many other views that were once widely held and now seem merely foolish. Such a comparison is misleading in one important respect, however: it understates the fervency with which materialist views are often held. In this respect, materialism often more closely resembles a religious conviction — and indeed, as I will suggest further in a couple of places below, defenses of materialism and especially replies to objections often have a distinctively scholastic or theological flavor.

A second sort of defense in favor of materialism appeals to the general idea of naturalism. Here again we have a view, like materialism itself, to which many, many philosophers pay allegiance while offering little by way of clear argument or defense, but here the view itself is much harder to pin down in a precise way. Indeed, even more striking than the absence of any very clear arguments is the fact that many recent philosophers seem so eager to commit themselves to naturalism — to fly the naturalist flag, as it were — while showing little agreement as to what exactly such a commitment involves. Thus naturalism seems to be even more obviously an intellectual bandwagon than materialism. (In addition, naturalism, for some of those who use the term, seems to just amount to materialism, which would make an argument from naturalism to materialism entirely question-begging.) ¶ Is there any genuine support for a materialist presumption to be found in the vicinity of naturalism? One version of naturalism is the idea that metaphysical issues — or philosophical issues generally — should be dealt with through the use of the methods of natural science. If this is accepted, and if it is true that following the methods of natural science leads plausibly to an endorsement of materialism, then at least some presumption in favor of materialism might follow. But both of the needed suppositions are in fact extremely dubious, to say the least. There is simply no good reason to think that the methods of natural science exhaust the methods of reasonable inquiry — indeed, as has often been pointed out, there is no plausible way in which that claim itself can be arrived at using those methods.

Truth is as much the first want as it is the first good of mankind: yes, truth in religion, which by giving us high and pure ideas of the Divinity, teaches us that our homage ought to be worthy of it; truth in morality, which without rigour, as without weak indulgence, traces out to men in all situations their respective duties; truth in policy, which by rendering authority more just, and subjects more submissive, protects governments from the passions of the multitude, and the multitude from the tyranny of governments; truth in our tribunals, which makes vice afraid, reassures and comforts the innocent, and conduces to the triumph of justice; truth in education, which by rendering conduct accordant with doctrine, makes teachers to be the models, as well as the masters of infancy and youth; truth in literature and in the arts, which preserves them from the contagion of bad taste, from false ornaments, and from false thoughts; truth in the commerce of life, which by banishing fraud and imposture, warrants the common safety; truth in every thing, truth before every thing, this is that which the whole human race from its inmost soul is ever seeking, so thoroughly convinced are all men that truth is useful and falsehood hurtful. ¶ When the doctrines of truth are universally inculcated, when they have penetrated into all hearts, and when they animate all classes of society, if they should not succeed in applying a remedy to all disorders, they would certainly have the happy effect of arresting the progress of very many; they would become the fruitful sources of generous sentiment and virtuous action; and they would make us feel that truth is the principle of all life to the social body. But if, on the other hand, error should obtain an ascendancy over the minds of men, and more particularly over the minds of those who are called upon to serve as guides and as examples, it will, by corrupting thought, sentiment, and action, become a principle of dissolution and of death.

Now he that sees, perceives that he sees; and he that hears, that he hears; and he that walks, that he walks; and in every other case, in the same manner, there is some faculty which perceives that we are energizing; so that we perceive that we are perceiving, and understand that we are understanding. But this is the same as saying that we perceive or understand that we exist; for existence was defined to be perceiving, or understanding. Now, to perceive that one is alive, is of the number of those things which are pleasant in themselves: for life is a good by nature: and to perceive the good which is inherent in one's self is pleasant. But life is eligible, and particularly to the good, because existence is to them good and pleasant; for by the consciousness of that which is absolutely a good, they are pleased.

On the other side, the hypothesis of divine creation is very unlikely. Although if there were a god with the traditional attributes and powers, he would be able and perhaps willing to create such a universe as this, we have to weigh in the scales the likelihood or unlikelihood that there is a god with these attributes and powers. And the key power ... is that of fulfilling intentions directly, without any physical or causal mediation, without materials or instruments. There is nothing in our background knowledge that makes it comprehensible, let alone likely, that anything should have such a power. All our knowledge of intention-fulfillment is of embodied intentions being fulfilled indirectly by way of bodily changes and movements which are causally related to the intended result, and where the ability thus to fulfill intentions itself has a causal history, either of evolutionary development or of learning or of both. Only by ignoring such key features do we get an analogue of the supposed divine action.

There is a crucial difference between these two cases. All other integrations into a super-science, of sciences dealing with entities and properties apparently qualitatively very distinct, was achieved by saying that really some of the entities and properties were not as they appeared to be; by making a distinction between the underlying (not immediately observable) entities and properties and the phenomenal properties to which they give rise. Thermodynamics was conceived with the laws of temperature exchange; and temperature was supposed to be a property inherent in an object. The felt hotness of a hot body is indeed qualitatively distinct from particle velocities and collisions. The reduction was achieved by distinguishing between the underlying cause of the hotness (the motion of the molecules) and the sensations which the motion of molecules cause in observers. The former falls naturally within the scope of statistical mechanics — for molecules are particles; the entities and properties are not now of distinct kinds. But this reduction has been achieved at the price of separating off the phenomenal from its causes, and only explaining the latter.

Computers function as they do because they have been constructed by human beings endowed with rational insight. And the results of their computations are accepted because they are evaluated by rational human beings as conforming to rational norms. A computer, in other words, is merely an extension of the rationality of its designers and users, it is no more an independent source of rational insight than a television set is an independent source of news and entertainment.

Erroneous statements and opinions, in their naked deformity, are generally too hideous to win the regard and confidence of men even in their present depraved condition; while the manifestation of what is true, in its simple grandeur and pure light, is often too bright and fair to be agreeable to the eye and the heart of man. The great work which a lover of truth finds to do, is to separate the conglomerate mass of knowledge, or what men call knowledge, into its two component parts, the true and the false. What is false owes all its plausibility and power to its being associated and mingled with what is true. What is true, is rendered dim and uncertain and weak by being blended and confounded with the erroneous. The human mind is like a thrashing-floor. The honest inquirer will be constantly using the fan, to separate the chaff from the wheat.

So far no attempt at naturalizing content has produced an explanation (analysis, reduction) of intentional content that is even remotely plausible. A symptom that something is radically wrong with the project is that intentional notions are inherently normative. They set standards of truth, rationality, consistency, etc., and there is no way that these standards can be intrinsic to a system consisting entirely of brute, blind, nonintentional causal relations. There is no mean component to billiard ball causation. Darwinian biological attempts at naturalizing content try to avoid this problem by appealing to what they suppose is the inherently teleological, normative character of biological evolution. But this is a very deep mistake. There is nothing normative or teleological about Darwinian evolution. Indeed, Darwin's major contribution was precisely to remove purpose, and teleology from evolution, and substitute for it purely natural forms.

More to the point, brain processes, composed as they are of meaningless chemical components, seem as inherently devoid of intentionality as soundwaves or ink marks. Any intentionality they have would also have to be derived from something else. But if anything physical would be devoid of intrinsic intentionality, whatever does have intrinsic intentionality would thereby have to be non-physical. Since the mind is the source of the intentionality of physical entities like sentences and pictures, and doesn't get its intentionality from anything else (there's no one "using" our minds to convey meaning) it seems to follow that the mind has intrinsic intentionality, and thus is non-physical.